i've been a twit for a while now. in fact i have a personal twitter page, a professional twitter page (carybcox) and our library has a twitter page that i keep updated (thecolonypl). my personal one is followed by friends and family, and i basically use the professional one to follow ala, library journal, a couple of other libraries and my favorite, Richard Wiseman, the all around cool and interesting author. Also, one called fleetwoodwack who makes crossword puzzles--like for the NY Times and all. I am in awe!
on our library twitter, we post events, links to slideshare for our monthly calendar powerpoint, and new books.