The proposals come soon after the government won the right to collect everyone's browsing history
Theresa May is planning to introduce huge regulations on the way the internet works, allowing the government to decide what is said online.
Particular focus has been drawn to the end of the manifesto, which makes clear that the Tories want to introduce huge changes to the way the internet works.
"Some people say that it is not for government to regulate when it comes to technology and the internet," it states. "We disagree."
Senior Tories confirmed to BuzzFeed News that the phrasing indicates that the government intends to introduce huge restrictions on what people can post, share and publish online.
The plans will allow Britain to become "the global leader in the regulation of the use of personal data and the internet", the manifesto claims.
It comes just soon after the Investigatory Powers Act came into law. That legislation allowed the government to force internet companies to keep records on their customers' browsing histories, as well as giving ministers the power to break apps like WhatsApp so that messages can be read.
The manifesto makes reference to those increased powers, saying that the government will work even harder to ensure there is no "safe space for terrorists to be able to communicate online". That is apparently a reference in part to its work to encourage technology companies to build backdoors into their encrypted messaging services – which gives the government the ability to read terrorists' messages, but also weakens the security of everyone else's messages, technology companies have warned.
The government now appears to be launching a similarly radical change in the way that social networks and internet companies work. While much of the internet is currently controlled by private businesses like Google and Facebook, Theresa May intends to allow government to decide what is and isn't published, the manifesto suggests.
The new rules would include laws that make it harder than ever to access pornographic and other websites. The government will be able to place restrictions on seeing adult content and any exceptions would have to be justified to ministers, the manifesto suggests.
The manifesto even suggests that the government might stop search engines like Google from directing people to pornographic websites. "We will put a responsibility on industry not to direct users – even unintentionally – to hate speech, pornography, or other sources of harm," the Conservatives write.
UK General Election 2017
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The laws would also force technology companies to delete anything that a person posted when they were under 18.
But perhaps most unusually they would be forced to help controversial government schemes like its Prevent strategy, by promoting counter-extremist narratives.
"In harnessing the digital revolution, we must take steps to protect the vulnerable and give people confidence to use the internet without fear of abuse, criminality or exposure to horrific content", the manifesto claims in a section called 'the safest place to be online'.
The plans are in keeping with the Tories' commitment that the online world must be regulated as strongly as the offline one, and that the same rules should apply in both.
"Our starting point is that online rules should reflect those that govern our lives offline," the Conservatives' manifesto says, explaining this justification for a new level of regulation.
"It should be as unacceptable to bully online as it is in the playground, as difficult to groom a young child on the internet as it is in a community, as hard for children to access violent and degrading pornography online as it is in the high street, and as difficult to commit a crime digitally as it is physically."
Conservative manifesto launch: In 90 seconds
The manifesto also proposes that internet companies will have to pay a levy, like the one currently paid by gambling firms. Just like with gambling, that money will be used to pay for advertising schemes to tell people about the dangers of the internet, in particular being used to "support awareness and preventative activity to counter internet harms", according to the manifesto.
The Conservatives will also seek to regulate the kind of news that is posted online and how companies are paid for it. If elected, Theresa May will "take steps to protect the reliability and objectivity of information that is essential to our democracy" – and crack down on Facebook and Google to ensure that news companies get enough advertising money.
If internet companies refuse to comply with the rulings – a suggestion that some have already made about the powers in the Investigatory Powers Act – then there will be a strict and strong set of ways to punish them.
"We will introduce a sanctions regime to ensure compliance, giving regulators the ability to fine or prosecute those companies that fail in their legal duties, and to order the removal of content where it clearly breaches UK law," the manifesto reads.
In laying out its plan for increased regulation, the Tories anticipate and reject potential criticism that such rules could put people at risk.
"While we cannot create this framework alone, it is for government, not private companies, to protect the security of people and ensure the fairness of the rules by which people and businesses abide," the document reads. "Nor do we agree that the risks of such an approach outweigh the potential benefits."