I've gotten the Twitter account set up and have the widget on the Library Services page. I've used Tweet Later to schedule tweets. The tweets display on the page via a widget, so you don't have to have a twitter account in order to see the posts. I also post things live along the way. I've tweeted things like public library events, author events at Barnes and Nobel, Author birthdays, district library stats (online databases, most circulated titles), reading quotes, links to library related resources online as well as some retweets from some of the people I follow on my own personal twitter account. Any suggestions as to other things I can post?