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vincevincevince - 12:34 pm on Aug 25, 2009 (gmt 0)
Next step would be to release tweetwords, in which you are allowed to put out promotional URLs, but you pay per click. Tweetwords would show in search results. Also, Twitsense would allow big twitter users to earn a commission by showing tweetwords from other publishers in their feed.
If I were asked to make money from Twitter, I would first clamp down on promotional URLs in tweets. This could be through filters, manual review of big accounts, and a report function.