I just started using Twitter. I'm finding it to generate more interest than everything except facebook. Perhaps it has something to do with the technique I'm using. Anyway, if you are a master tweeter, share your knowledge here. Once I get a solid grasp on Twitter, I'll share it with you guys. I will say this, though: Twitter seems to be the preferred medium for literary types, while tumblr is dominated by visual artists. I'm following various publishers, agents, authors, and editors. Some have even followed me back. I'll share my experiences as they come.