Google has found a way to use the popular microblogging service to sell ads, and started offering marketers ad units that stream their five most recent "tweets" across the Google AdSense network. The first marketer to use the ad units is Intuit, whose TurboTax is boosting its Twitter followers. "It's syndicating whatever the team that works on the TurboTax Twitter account [@turbotax] posts," said Seth Greenberg, director of marketing at Intuit. When a user clicks on an ad it takes them not to TurboTax.com but to twitter.com/turbotax.