No sooner did I ask "what's the business model?" for Twitter, than a commenter said this:

Let’s assume that there are 20,000 people on Twitter who have added Starbucks as a Friend in order to get a few promotions a week - e.g. a free cookie with your coffee, a free tall coffee, etc. If Twitter charged Starbucks a few cents per tweet per follower, the revenue from Starbucks might looks something like this:

20,000 followers
10 tweets (promotions) per week
$.05 cents per tweet for each follower (maybe more???)
that’s $10 K per week or about $40K per month

I have no idea whether they are thinking along those lines, but they should be.

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