Social media should be regulated and forced to federate to combat their monopoly, for one. People spend years and years building up followings on these platforms, and since users themselves are the creators of the content that Facebook and Twitter are selling, they should have more legal protections of their rights. Like the 20th century labor movements, there needs to be a 21st century user/consumer movement. Users should have certain rights protected by law, including the right to transfer to a compatible and competing service (just as users have the right to retain their cell phone number when transferring carriers) and the right to consume content from compatible services in their social media feed.
As for filtering content, users should have the power there, too, just as they do their spam filter in their email account. They should have the ability to set their own parameters and leave it at that. Unless its blatantly illegal content, it should be protected, period, or the platforms should be classified as publishers and be subject to all the same legal liabilities that publishers are.