The company has been banned by its hosting provider, GoDaddy, meaning that it no longer works. In its place is a holding message claiming the site is "under attack".
"As we transition to a new hosting provider Gab will be inaccessible for a period of time," the message reads. "We are working around the clock to get Gab.com back online. Thank you and remember to speak freely."
Gadgets and tech news in pictures
Show all 43
Gadgets and tech news in pictures
1/43
Designed by Pierpaolo Lazzarini from Italian company Jet Capsule. The I.F.O. is fuelled by eight electric engines, which is able to push the flying object to an estimated top speed of about 120mph.
Jet Capsule/Cover Images
2/43
A humanoid robot gestures during a demo at a stall in the Indian Machine Tools Expo, IMTEX/Tooltech 2017 held in Bangalore
Getty Images
3/43
A humanoid robot gestures during a demo at a stall in the Indian Machine Tools Expo, IMTEX/Tooltech 2017 held in Bangalore
Getty Images
4/43
Engineers test a four-metre-tall humanoid manned robot dubbed Method-2 in a lab of the Hankook Mirae Technology in Gunpo, south of Seoul, South Korea
Jung Yeon-Je/AFP/Getty Images
5/43
Engineers test a four-metre-tall humanoid manned robot dubbed Method-2 in a lab of the Hankook Mirae Technology in Gunpo, south of Seoul, South Korea
Jung Yeon-Je/AFP/Getty Images
6/43
The giant human-like robot bears a striking resemblance to the military robots starring in the movie 'Avatar' and is claimed as a world first by its creators from a South Korean robotic company
Jung Yeon-Je/AFP/Getty Images
7/43
Engineers test a four-metre-tall humanoid manned robot dubbed Method-2 in a lab of the Hankook Mirae Technology in Gunpo, south of Seoul, South Korea
Jung Yeon-Je/AFP/Getty Images
8/43
Waseda University's saxophonist robot WAS-5, developed by professor Atsuo Takanishi
Rex
9/43
Waseda University's saxophonist robot WAS-5, developed by professor Atsuo Takanishi and Kaptain Rock playing one string light saber guitar perform jam session
Rex
10/43
A test line of a new energy suspension railway resembling the giant panda is seen in Chengdu, Sichuan Province, China
Reuters
11/43
A test line of a new energy suspension railway, resembling a giant panda, is seen in Chengdu, Sichuan Province, China
Reuters
12/43
A concept car by Trumpchi from GAC Group is shown at the International Automobile Exhibition in Guangzhou, China
Rex
13/43
A Mirai fuel cell vehicle by Toyota is displayed at the International Automobile Exhibition in Guangzhou, China
Reuters
14/43
A visitor tries a Nissan VR experience at the International Automobile Exhibition in Guangzhou, China
Reuters
15/43
A man looks at an exhibit entitled 'Mimus' a giant industrial robot which has been reprogrammed to interact with humans during a photocall at the new Design Museum in South Kensington, London
Getty
16/43
A new Israeli Da-Vinci unmanned aerial vehicle manufactured by Elbit Systems is displayed during the 4th International conference on Home Land Security and Cyber in the Israeli coastal city of Tel Aviv
Getty
17/43
Electrification Guru Dr. Wolfgang Ziebart talks about the electric Jaguar I-PACE concept SUV before it was unveiled before the Los Angeles Auto Show in Los Angeles, California, U.S
Reuters
18/43
The Jaguar I-PACE Concept car is the start of a new era for Jaguar. This is a production preview of the Jaguar I-PACE, which will be revealed next year and on the road in 2018
AP
19/43
Japan's On-Art Corp's CEO Kazuya Kanemaru poses with his company's eight metre tall dinosaur-shaped mechanical suit robot 'TRX03' and other robots during a demonstration in Tokyo, Japan
Japan's On-Art Corp's eight metre tall dinosaur-shaped mechanical suit robot 'TRX03' performs during its unveiling in Tokyo, Japan
Reuters
22/43
Singulato Motors co-founder and CEO Shen Haiyin poses in his company's concept car Tigercar P0 at a workshop in Beijing, China
Reuters
23/43
The interior of Singulato Motors' concept car Tigercar P0 at a workshop in Beijing, China
Reuters
24/43
Singulato Motors' concept car Tigercar P0
Reuters
25/43
A picture shows Singulato Motors' concept car Tigercar P0 at a workshop in Beijing, China
Reuters
26/43
Connected company president Shigeki Tomoyama addresses a press briefing as he elaborates on Toyota's "connected strategy" in Tokyo.
The Connected company is a part of seven Toyota in-house companies that was created in April 2016
Getty
27/43
A Toyota Motors employee demonstrates a smartphone app with the company's pocket plug-in hybrid (PHV) service on the cockpit of the latest Prius hybrid vehicle during Toyota's "connected strategy" press briefing in Tokyo
Getty
28/43
An exhibitor charges the battery cells of AnyWalker, an ultra-mobile chasis robot which is able to move in any kind of environment during Singapore International Robo Expo
Getty
29/43
A robot with a touch-screen information apps stroll down the pavillon at the Singapore International Robo Expo
Getty
30/43
An exhibitor demonstrates the AnyWalker, an ultra-mobile chasis robot which is able to move in any kind of environment during Singapore International Robo Expo
Getty
31/43
Robotic fishes swim in a water glass tank displayed at the Korea pavillon during Singapore International Robo Expo
Getty
32/43
An employee shows a Samsung Electronics' Gear S3 Classic during Korea Electronics Show 2016 in Seoul, South Korea
Reuters
33/43
Visitors experience Samsung Electronics' Gear VR during the Korea Electronics Grand Fair at an exhibition hall in Seoul, South Korea
Getty
34/43
Amy Rimmer, Research Engineer at Jaguar Land Rover, demonstrates the car manufacturer's Advanced Highway Assist in a Range Rover, which drives the vehicle, overtakes and can detect vehicles in the blind spot, during the first demonstrations of the UK Autodrive Project at HORIBA MIRA Proving Ground in Nuneaton, Warwickshire
PA wire
35/43
Chris Burbridge, Autonomous Driving Software Engineer for Tata Motors European Technical Centre, demonstrates the car manufacturer's GLOSA V2X functionality, which is connected to the traffic lights and shares information with the driver, during the first demonstrations of the UK Autodrive Project at HORIBA MIRA Proving Ground in Nuneaton, Warwickshire
PA wire
36/43
Ford EEBL Emergency Electronic Brake Lights is demonstrated during the first demonstrations of the UK Autodrive Project at HORIBA MIRA Proving Ground in Nuneaton, Warwickshire
PA
37/43
Full-scale model of 'Kibo' on display at the Space Dome exhibition hall of the Japan Aerospace Exploration Agency (JAXA) Tsukuba Space Center, in Tsukuba, north-east of Tokyo, Japan
EPA
38/43
Miniatures on display at the Space Dome exhibition hall of the Japan Aerospace Exploration Agency (JAXA) Tsukuba Space Center, in Tsukuba, north-east of Tokyo, Japan.
In its facilities, JAXA develop satellites and analyse their observation data, train astronauts for utilization in the Japanese Experiment Module 'Kibo' of the International Space Station (ISS) and develop launch vehicles
EPA
39/43
The robot developed by Seed Solutions sings and dances to the music during the Japan Robot Week 2016 at Tokyo Big Sight. At this biennial event, the participating companies exhibit their latest service robotic technologies and components
Getty
40/43
The robot developed by Seed Solutions sings and dances to music during the Japan Robot Week 2016 at Tokyo Big Sight
Getty
41/43
Government and industry are working together on a robot-like autopilot system that could eliminate the need for a second human pilot in the cockpit
AP
42/43
Aurora Flight Sciences' technicians work on an Aircrew Labor In-Cockpit Automantion System (ALIAS) device in the firm's Centaur aircraft at Manassas Airport in Manassas, Va.
AP
43/43 Flight Simulator
Stefan Schwart and Udo Klingenberg preparing a self-built flight simulator to land at Hong Kong airport, from Rostock, Germany
EPA
1/43
Designed by Pierpaolo Lazzarini from Italian company Jet Capsule. The I.F.O. is fuelled by eight electric engines, which is able to push the flying object to an estimated top speed of about 120mph.
Jet Capsule/Cover Images
2/43
A humanoid robot gestures during a demo at a stall in the Indian Machine Tools Expo, IMTEX/Tooltech 2017 held in Bangalore
Getty Images
3/43
A humanoid robot gestures during a demo at a stall in the Indian Machine Tools Expo, IMTEX/Tooltech 2017 held in Bangalore
Getty Images
4/43
Engineers test a four-metre-tall humanoid manned robot dubbed Method-2 in a lab of the Hankook Mirae Technology in Gunpo, south of Seoul, South Korea
Jung Yeon-Je/AFP/Getty Images
5/43
Engineers test a four-metre-tall humanoid manned robot dubbed Method-2 in a lab of the Hankook Mirae Technology in Gunpo, south of Seoul, South Korea
Jung Yeon-Je/AFP/Getty Images
6/43
The giant human-like robot bears a striking resemblance to the military robots starring in the movie 'Avatar' and is claimed as a world first by its creators from a South Korean robotic company
Jung Yeon-Je/AFP/Getty Images
7/43
Engineers test a four-metre-tall humanoid manned robot dubbed Method-2 in a lab of the Hankook Mirae Technology in Gunpo, south of Seoul, South Korea
Jung Yeon-Je/AFP/Getty Images
8/43
Waseda University's saxophonist robot WAS-5, developed by professor Atsuo Takanishi
Rex
9/43
Waseda University's saxophonist robot WAS-5, developed by professor Atsuo Takanishi and Kaptain Rock playing one string light saber guitar perform jam session
Rex
10/43
A test line of a new energy suspension railway resembling the giant panda is seen in Chengdu, Sichuan Province, China
Reuters
11/43
A test line of a new energy suspension railway, resembling a giant panda, is seen in Chengdu, Sichuan Province, China
Reuters
12/43
A concept car by Trumpchi from GAC Group is shown at the International Automobile Exhibition in Guangzhou, China
Rex
13/43
A Mirai fuel cell vehicle by Toyota is displayed at the International Automobile Exhibition in Guangzhou, China
Reuters
14/43
A visitor tries a Nissan VR experience at the International Automobile Exhibition in Guangzhou, China
Reuters
15/43
A man looks at an exhibit entitled 'Mimus' a giant industrial robot which has been reprogrammed to interact with humans during a photocall at the new Design Museum in South Kensington, London
Getty
16/43
A new Israeli Da-Vinci unmanned aerial vehicle manufactured by Elbit Systems is displayed during the 4th International conference on Home Land Security and Cyber in the Israeli coastal city of Tel Aviv
Getty
17/43
Electrification Guru Dr. Wolfgang Ziebart talks about the electric Jaguar I-PACE concept SUV before it was unveiled before the Los Angeles Auto Show in Los Angeles, California, U.S
Reuters
18/43
The Jaguar I-PACE Concept car is the start of a new era for Jaguar. This is a production preview of the Jaguar I-PACE, which will be revealed next year and on the road in 2018
AP
19/43
Japan's On-Art Corp's CEO Kazuya Kanemaru poses with his company's eight metre tall dinosaur-shaped mechanical suit robot 'TRX03' and other robots during a demonstration in Tokyo, Japan
Japan's On-Art Corp's eight metre tall dinosaur-shaped mechanical suit robot 'TRX03' performs during its unveiling in Tokyo, Japan
Reuters
22/43
Singulato Motors co-founder and CEO Shen Haiyin poses in his company's concept car Tigercar P0 at a workshop in Beijing, China
Reuters
23/43
The interior of Singulato Motors' concept car Tigercar P0 at a workshop in Beijing, China
Reuters
24/43
Singulato Motors' concept car Tigercar P0
Reuters
25/43
A picture shows Singulato Motors' concept car Tigercar P0 at a workshop in Beijing, China
Reuters
26/43
Connected company president Shigeki Tomoyama addresses a press briefing as he elaborates on Toyota's "connected strategy" in Tokyo.
The Connected company is a part of seven Toyota in-house companies that was created in April 2016
Getty
27/43
A Toyota Motors employee demonstrates a smartphone app with the company's pocket plug-in hybrid (PHV) service on the cockpit of the latest Prius hybrid vehicle during Toyota's "connected strategy" press briefing in Tokyo
Getty
28/43
An exhibitor charges the battery cells of AnyWalker, an ultra-mobile chasis robot which is able to move in any kind of environment during Singapore International Robo Expo
Getty
29/43
A robot with a touch-screen information apps stroll down the pavillon at the Singapore International Robo Expo
Getty
30/43
An exhibitor demonstrates the AnyWalker, an ultra-mobile chasis robot which is able to move in any kind of environment during Singapore International Robo Expo
Getty
31/43
Robotic fishes swim in a water glass tank displayed at the Korea pavillon during Singapore International Robo Expo
Getty
32/43
An employee shows a Samsung Electronics' Gear S3 Classic during Korea Electronics Show 2016 in Seoul, South Korea
Reuters
33/43
Visitors experience Samsung Electronics' Gear VR during the Korea Electronics Grand Fair at an exhibition hall in Seoul, South Korea
Getty
34/43
Amy Rimmer, Research Engineer at Jaguar Land Rover, demonstrates the car manufacturer's Advanced Highway Assist in a Range Rover, which drives the vehicle, overtakes and can detect vehicles in the blind spot, during the first demonstrations of the UK Autodrive Project at HORIBA MIRA Proving Ground in Nuneaton, Warwickshire
PA wire
35/43
Chris Burbridge, Autonomous Driving Software Engineer for Tata Motors European Technical Centre, demonstrates the car manufacturer's GLOSA V2X functionality, which is connected to the traffic lights and shares information with the driver, during the first demonstrations of the UK Autodrive Project at HORIBA MIRA Proving Ground in Nuneaton, Warwickshire
PA wire
36/43
Ford EEBL Emergency Electronic Brake Lights is demonstrated during the first demonstrations of the UK Autodrive Project at HORIBA MIRA Proving Ground in Nuneaton, Warwickshire
PA
37/43
Full-scale model of 'Kibo' on display at the Space Dome exhibition hall of the Japan Aerospace Exploration Agency (JAXA) Tsukuba Space Center, in Tsukuba, north-east of Tokyo, Japan
EPA
38/43
Miniatures on display at the Space Dome exhibition hall of the Japan Aerospace Exploration Agency (JAXA) Tsukuba Space Center, in Tsukuba, north-east of Tokyo, Japan.
In its facilities, JAXA develop satellites and analyse their observation data, train astronauts for utilization in the Japanese Experiment Module 'Kibo' of the International Space Station (ISS) and develop launch vehicles
EPA
39/43
The robot developed by Seed Solutions sings and dances to the music during the Japan Robot Week 2016 at Tokyo Big Sight. At this biennial event, the participating companies exhibit their latest service robotic technologies and components
Getty
40/43
The robot developed by Seed Solutions sings and dances to music during the Japan Robot Week 2016 at Tokyo Big Sight
Getty
41/43
Government and industry are working together on a robot-like autopilot system that could eliminate the need for a second human pilot in the cockpit
AP
42/43
Aurora Flight Sciences' technicians work on an Aircrew Labor In-Cockpit Automantion System (ALIAS) device in the firm's Centaur aircraft at Manassas Airport in Manassas, Va.
AP
43/43 Flight Simulator
Stefan Schwart and Udo Klingenberg preparing a self-built flight simulator to land at Hong Kong airport, from Rostock, Germany
EPA
It was just the latest in a series of companies to drop the website, which has been linked to the far-right. Payment companies such as PayPal and Stripe also took the decision to stop offering services to Gab.
The official Gab account continues to be active on Twitter. There, it has spent hours attacking the decision to take the site down, and attempting to push a conspiracy theory that there is a conspiracy by "Big Tech" to remove it from the internet.
It also re-posted the message that it had displayed on its website, where it said the network was "under attack".
The outage came after GoDaddy said that it had told Gab.com it had "24 hours to move the domain to another registrar", according to a spokesperson. The ban came because the site had violated its terms of service and hosted content that "promotes and encourages violence against people", it said.
Gab has been active for some time and has been repeatedly criticised for allowing violent and far-right content on its platform. But the latest outage comes after it was thrust in the mainstream when it was found to have been used by the suspect in the Pittsburgh shooting, where 11 people died in the deadliest attack on the Jewish community in the United States.
Founded in 2016 by conservative Andrew Torba, Gab bills itself as the "free speech" alternative to Twitter Inc and Facebook Inc and has become a popular place to post content unwelcome or prohibited on other platforms.
Notable users include right-wing provocateur Milo Yiannopoulos and Andrew Anglin, the founder of the neo-Nazi Daily Stormer website, as well as media personalities Alex Jones and Carl Benjamin.
Utsav Sanduja, Gab's former chief operating officer, said the company and its mission will survive "guilt by association" and could do more fundraising through cryptocurrencies in order to bypass tech companies.
"We created Gab for the purpose of letting off steam not to kill. That was not our intention," he said.
In earlier statements, the website said it was cooperating with law enforcement authorities and described the moves by PayPal and others as acts of "direct collusion between big tech giants." It also called on U.S. President Donald Trump to act.
Support free-thinking journalism and subscribe to Independent Minds
On Sunday, Gab's forum lit up with comments about the Pittsburgh attack.
One user celebrated Gab being banned by PayPal while another user responded, "You are going to get shot at ur local synagogue." Another posted, "I WAS RIGHT, THEY FAKED THE SYNAGOGUE SHOOTING."
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Independent Minds Comments can be posted by members of our membership scheme, Independent Minds. It allows our most engaged readers to debate the big issues, share their own experiences, discuss real-world solutions, and more. Our journalists will try to respond by joining the threads when they can to create a true meeting of independent minds. The most insightful comments on all subjects will be published daily in dedicated articles. You can also choose to be emailed when someone replies to your comment.
The existing Open Comments threads will continue to exist for those who do not subscribe to Independent Minds. Due to the sheer scale of this comment community, we are not able to give each post the same level of attention, but we have preserved this area in the interests of open debate. Please continue to respect all commenters and create constructive debates.