Twitter is an online application that is part blog, part social networking site, and part cell phone/IM tool. It is designed to let users describe that they are doing or thinking at a given moment, in 140 characters or less. I led this hands-on session at Faculty Summer Institute 2010 introducing the Twitter microblogging tool and discussing its mobile collaboration potential in the learning environment. The interactive online handout, resource links, and video archive are available. I also offered an advanced Twitter workshop at FSI with more tips and tricks.