It has occurred to me that almost every programmer has a presence on Twitter. I've tried using Twitter, and I just find it as a time sink (not unlike browsing Hacker News). How do people manage to engage their followers on Twitter while working a full-time job and contributing to dozens of open source projects and having a family and, and...?
I always want to spend most of my spare time either programming or reading, and I still feel like I don't have enough time for those things.
After SXSW, it just went quiet. I had no use for it. Didn't really get it.
Last year I found out that a few colleagues that don't use Facebook but swear by Twitter, so I gave it a shot.
I started following my colleagues, and saw how they were reposting articles, I started following those posters, etc etc. It is now part of my media consumption. I get different content and ideas than I do through HN and FB.
That's been my experience, and now I find myself tweeting a bit more. Just my 2cents.