When you think of a social network, you have these two-way interactions: "Are you my friend? Yes? No? Yes?" Like LinkedIn, it's business oriented, but it's all about establishing connections. You connect to me through my other connections, and that sort of thing, and you sort of define who your friends are. Twitter doesn't have that.

There are a lot of sources of information out there, so why don't you curate for yourself a list, like a real timeline of information, like the New York Times, or JetBlue, or your friends, or this comedian, or this guy who pretends to be a cat, or whatever it is, whatever entertains you, whatever you find useful.

With Twitter, it's as easy to unfollow as it is to follow.

Even though running is physically straining, it's mentally refreshing. Especially when you feel like you've accomplished something.

Constraint inspires creativity

I think Twitter has brought something totally new to the table.

The two things I use the most are the MacBook Air and my iPhone. Those are my two most-used gadgets that are dented, scratched and smashed.