Machine learning can fix Twitter, Facebook, and maybe even America

I've done it a hundred times. Someone called it "a clown car that drove into a gold mine," and like all clown cars, Twitter makes the passengers get out once in awhile. If I go back, it's because I'm addicted. For an information junkie, that little bubble is hard to resist. But Twitter -- and Facebook, for that matter -- is desperately broken in ways that alienate users, spread hate and endanger us as a species.