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When we first looked at MillionDollarFollow, a new Twitter advertising network with some interesting twists, we couldn't help but compare it to the Million Dollar Homepage. MillionDollarFollow (MDF) is quite different, however. Instead of advertising a product or tweeting affiliate links, MDF tries to get its users more followers. Rather than thinking about MDF as an advertising network, it's actually probably best to think about it as a Twitter lottery with some added benefits, even if you don't win. An ad on MDF costs $1, and users who buy an ad are regularly entered into a lottery drawing where they can win new followers. The final winner will receive 1 million followers.

Auto-following is a sensitive topic on Twitter, and the release of TwitterMass is surely going to create some controversy, as it takes auto-following to the next level. TwitterMass is a clever tool that automates what many Twitter users are already doing: finding new Twitter users to follow by searching for keywords and then following the most interesting of these users. One twist here, however, is that TwitterMass also automatically unfollows users who don't follow you back within a few days. The point of this, of course, is to create a larger network of followers, which, because it is built on top of keyword and hashtag searches, should, at least in theory, be built on mutual interests.