What Is Twitter? by Debra Simpson | Apr 14, 2008 | Twitter, Video | 0 comments Chris Pirillo explains Twitter and how he uses it. You should also check out his site. He has a live video stream. You can watch him work. I’m not sure I’d want anyone watching me while I work. Submit a Comment Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website Notify me of follow-up comments by email. Notify me of new posts by email.