The recent post-election unrest in Iran was certainly a coming-out party for Twitter. Unfortunately, it was also the end of innocence for the micro-blogging social network. While Twitter users broke news about demonstrations, UK-based furniture retailer Habitat exploited the site's hashtags, which allow users to follow topics rather than people. So, for example, following #mousavi on Twitter would result in tweets related to the Iranian incumbent's challenger. Or, in the case of Habitat's tweets, you'd get "#MOUSAVI Join the database for free to win a £1,000 gift card." Despicable? Yes. Inevitable? Most definitely. As a user on Consumerist.com commented, "I don't know what's worse, people FINALLY realizing Twitter can be used for advertising using popular keywords, or Twitter fans thinking it never would."