Well...I don't think I like Twitter. I have Facebook, after my friend made an account for me since I was reluctant to get in contact with people from my High School, and Twitter as some similarities to Facebook that I don't like. Facebook has that Home Page were people can read what everyone is doing. People can be very nosy about everyone's business. I don't want people knowing if I'm sleepy or late for work, etc. No one is that special and who actually cares? It isn't news worthy if I take a poo. I also don't have internet at home right now so it would be really hard to update this thing. By the way my name for twitter is JamieLKay, but I don't think I'll be using it.
Twitter for the library could work as a way to update people about library closing or upcoming events. But they would have to be following the twitter feed and I just don't see people doing that is large groups. Teens might...but only if they already have a Twitter account.