Yes, Twitter has challenges in monetizing, and yes, Twitter is weird, and yes, Twitter hasn't made a profit yet. But fundamentally, Twitter is still the preferred platform for following media, celebrities, politicians, internet-famous-people, and quick ad-hoc public communication with those people. And just like how Facebook's success is that all your friends are there, Twitter's success is that every public figure you're interested in is there, even the geeky small nuts-and-bolts types like writers and programmers and artists.

It has become the public plaza of the Internet.

If I want to post pictures of my kids, I'll do it on Facebook. If I want to pick a fight with my city councillor about a decision he made or get in touch with a script-writer of my favourite movie, I'll do it on Twitter.