What the heck am I supposed to do on Twitter?
Answer the question, “What are you doing?” in 140 characters or less. That would be the obvious reply, but I can tell you’re looking for a little more than that.
Start out by posting a few things: links to things you find interesting or relevant (use tinyurl.com). Make sure your profile is complete, and definitely include a link in your bio so others can get an idea of who you are. Once you’ve set up the basics, start following people you find interesting, or who’d you’d like to keep in touch with.