There's an actual marketplace open for selling Twitter names - check out http://tweexchange.com. Add one more thing to the list of protections a company needs to worry about beyond domain squatting.

There's also a weird side to this: people who've built up large lists of followers offering to sell their accounts. Right on the top of the page is a banner claiming that "CNN just bought CNNBRK". I don't know how much of a market there is in this, but a glance at the exchange page shows a few hopeful squatters...

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