I've been wondering how Twitter was planning to make money, and now we're seeing the plan - it's a first derivative from advertising:

Thau says Twitter is developing a range of analytics and metrics products and services built around the information contained in "tweets," the e-mail and text messages that pass through its platform. "We can measure the tweets," he says. "We're trying to figure out what are the appropriate metrics around engagement and how to convey those."

How would that work? Would Twitter sell that directly? Would Twitter users be happy to see contextual advertising? How contextual can that advertising get at 140 characters per post? Who are the potential buyers of these analytics?

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