One way to do this is to mandate that social network platforms follow new standards. Another is to quietly build an alternative world using these standards and let people realise that it is better — just as they did when leaving restricted online services AOL and Prodigy for the freedom of the web.
Tim mentions a new standard called Solid, that acts as a wallet. People can build new apps that request access to user data in that wallet, and the user has control of that. I have one question: Do we need this? It’s presuming that some kind of social media is part of the solution. I don’t know if that’s true.