Twitter is a social network and microblogging platform that lends itself to some imaginative purposes besides communication. A Twitter account can be a single-subject blog or a single joke. It can be an experiment in what software can do, or what people will believe. It can be a medium for social protest. It can even be a webcomic site. Here are some strange and different Twitter feeds that you might get a laugh out of once, or you might want to follow long-term, in a list I posted at mental_floss.