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Facebook has changed its safety check feature to have a specific Paris focus following the terrorist attacks on the French capital.
If the social media app notices a user's device is located in Paris, it will ask them whether they are safe.
The "Safety Check" tool will then notify all the friends of that person that they have marked themselves alive.
Users can also check on a list of friends who may be caught up in the tragedy which unfolded in Paris on Friday night, followed by The Independent live blog here.
Location is determined by the city in which a person uses internet, the city listed in their profile or their last location if they use the Nearby Friends product.
The Facebook Safety Check mobile app is asking users located in Paris whether they are safe (Facebook) If someone is not in the Paris area, they can select "I'm not in the area."
Twitter followers based in the capital also offered safe refuge to fellow citizens with the hash tag #PorteOuverte, inviting those too afraid to make longer journeys home to stay with them.
Show all 25 1 /25In pictures: Paris attacks In pictures: Paris attacks Paris attacks French police with protective shields walk in line near the Bataclan concert hall
Reuters
In pictures: Paris attacks Paris attacks Rescuers evacuate an injured person on Boulevard des Filles du Calvaire
AFP
In pictures: Paris attacks Paris attacks French Vigipirate troops mobilize next to Place de la Bastille
AFP
In pictures: Paris attacks Paris attacks French soldiers mobilize near to the Place de la Bastille
AFP
In pictures: Paris attacks Paris attacks Wounded people are evacuated outside the scene of a hostage situation at the Bataclan theatre
EPA
In pictures: Paris attacks Paris attacks People react as they gather to watch the scene near the Bataclan concert hall
Reuters
In pictures: Paris attacks Paris attacks French police secure the area outside a cafe near the Bataclan concert hall
Reuters
In pictures: Paris attacks Paris attacks Rescuers workers evacuate victims near the Bataclan concert hall
AFP
In pictures: Paris attacks Paris attacks French Prime Minister Manuel Valls and French President Francois Hollande attending an emergency meeting at the Interior Ministry
AFP
In pictures: Paris attacks Paris attacks Spectators invade the pitch of the Stade de France after explosions were heard outside
AP
In pictures: Paris attacks Paris attacks A man lies on the ground as French police check his identity near the Bataclan concert hall
Reuters
In pictures: Paris attacks Paris attacks Police officers man a position close to the Bataclan theatre
AFP
In pictures: Paris attacks Paris attacks Wounded people are evacuated from the Stade de France in Paris
EPA
In pictures: Paris attacks Paris attacks Two men evacuate the Place de la Republique square in Paris as a police officer looks on
AFP
In pictures: Paris attacks Paris attacks Football fans are evacuated from the Stade de France stadium
In pictures: Paris attacks Paris attacks An armed police officer
Dan Gabriel
In pictures: Paris attacks Paris attacks The Stade de France is evacuated after reports of an explosion
In pictures: Paris attacks Paris attacks A member of the French fire brigade aids an injured individual near the Bataclan concert hall
In pictures: Paris attacks Paris attacks Wounded people are evacuated from the Stade de France in Paris
In pictures: Paris attacks Paris attacks Police are seen outside a cafe in 10th arrondissement of the French capital Paris,
In pictures: Paris attacks Paris attacks Rescuers assist an injured man on Boulevard des Filles du Calvaire, close to the Bataclan concert hall
AFP
In pictures: Paris attacks Paris attacks The scene at a restaurant in 10th arrondissement
In pictures: Paris attacks Paris attacks The Bataclan theatre - where around 100 people are thought be held hostage
In pictures: Paris attacks Paris attacks The Stade de France as it was evacuated
In pictures: Paris attacks Paris attacks Forensic experts inspect the site of an attack outside the Stade de France stadium in Saint-Denis
AFP
The death toll from the attacks, now claimed by radical Islamist terror group Isis, is believed to be more than 120.
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