Everybody tweets. We get it. There isn't a soul in Chicago without a Twitter account, but that doesn't mean you should follow every single person in your El train car. Allow us to lend some clarity to the art of the Twitter follow, with a little help from an expert. Enter Lisa Frame, the Chicago Community Manager at Loopt, and the brains behind the networking blog Mugshot Monday. With this impressive, uh, social resume, Frame is clearly a wiz at sniffing out the coolest projects, raddest events, and general local awesomeness that city dwellers need to know about. Click through to learn about the 20 most mandatory Chicago Twitter accounts according to Lisa, and then start expanding (or narrowing) your follow list. If your friends want to know how you suddenly became so savvy about all things social in Chicago, just tell them a little birdie told you.