I don't think you should use Twitter or Facebook anyways if you're concerned about the free flow of information. They censor stuff and try to make walled gardens. I'm not sure what the good alternatives are... I've heard of confederated Twitter and Facebook clones but they all suffer from losing out on network effects.

If 4 companies control the internet, having the government restrain from censoring them doesn't fix the problem. What do you think we should do? I'm at a loss here.