Tweetup

Is this an earner for Twitter or for another third party app? Tweetup appears to be following the GoogleAd model, identifying keywords within Tweets (on which advertisers will bid for keywords)... will this be seen as diminishing what many love about Twitter (largely non-commercial, or at least a choice about engaging with those commercial feeds), or will it be win-win, allowing you to find those Tweeters you are most interested in following via the interests…