Twitter has started taking its revenue streams seriously, industry watchers say, and advertisers look likely to follow suit. After two years of strong user growth, the social site is looking to monetize by offering innovative ad formats and hiring a raft of new advertising staff -- and while everyone's still feeling their way forward, many marketers say they expect Twitter to turn into a major ad platform. "I completely have the same vibe on Twitter as Google, Facebook and DoubleClick. You can tell by the client interest levels," said Curt Hecht, an executive with digital agency Publicis Groupe.
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