It seems like everyone knows what Twitter is these days. News shows on CNN usually make me cringe when they start showing tweets on air. But there has been a lot of discussion lately on how to start making money off of Twitter. It seems like the first step has already begun. It’s funny, but Identi.ca, an open source microblogging service very similar to Twitter, has a much more sustainable idea of how to make money in this industry. They also have a number of technical advantages, just not the number of users. It’ll be interesting to see where they both are next year.