I've had a personal Twitter account for a while. I read about it it Library Journal or School Library Journal, well in one of the catalogs that circulate around the Library. At first I updated once a day then I kind of let it go by the wayside. Periodically I try to update more often, but it never seems to stick.
I also maintain a Twitter for the Library, but we don't have a lot of followers and the people that do ask to follow are usually spammers with lovely porn sites. I'm all for free speech but really, the line has to be drawn somewhere. While I was on vacation the Library Twitter didn't get updated, but I'm going to start updating again today.
I have friends that Twitter all of the time. They leave Twitter on all day and open in periodically to add a new Tweet. I just can't seem to get that dedicated mostly because I can't imagine anyone really caring what I'm doing right now.