Any guesses who would be the most likely buyer? Google, Yahoo, Apple, or Microsoft would be obvious candidates, maybe Facebook. I'd be interested to see Facebook buy them and get all those reviews and reviewers integrated into the graph. It would be amazing to be able to target Facebook ads at people based on how they reviewed specific businesses or categories of businesses.
I don't know if "amazing" is the first word that comes to mind when I think about my reviews of businesses being made available to advertisers in this way.