Twitter made a small but important move in its evolution as an ad platform this week with the introduction of its first mobile ad unit. The move was greeted with predictable complaints from the early-adopter crowd. Twitter CEO Dick Costolo is focused on building out the Twitter platform in a way that doesn’t turn off its growing user base. There’s plenty of work to be done. Twitter just introduced ad products last year, Promoted Tweets, Promoted Trending Topics and Promoted Accounts. According to eMarketer, Twitter generated $45 million in revenue in 2010. With former MySpace sales exec Adam Bain building out a sales team, the company clearly plans to increase that quickly.
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