I think Facebook is not after FB Purity. They are after anyone who could come up with a plugin that scrapes the content and stores it to a db. People using the plugin would get access to the db in exchange: companies could look up prospective employees, ex-girlfriends spy on their defriended ex-boyfriends, etc.

Hell, the idea is so tempting that someone is definitely doing this already. And you'd only need a percentile of the users to get the information for every other facebook user.