According to a new story, Google will begin indexing Facebook posts. In the story, Scott Gilbertson @wired says, "any time you use a Facebook comment form on a other sites, or a public page within Facebook, those comments will be indexed by Google. The new indexing plan isn’t just about Facebook comments, but applies to nearly any content that’s previously been accessible only through an HTTP POST request."
This is important for many reasons, not the least of which, a 2009 study found "45% Employers use Facebook-Twitter to screen job candidates."
Despite the technology change, the best policy is still: Don't post anything sensitive on fb or anywhere else on the web.