Their newest problem, the Facebook 3.1 app for iPhone scans your address book for phone numbers and emails in your contact list, scans Facebook, and syncs the profile pics with your contact list. Even for those people you are not Facebook friends with.
For an example of how this can be troublesome, an iPhone blog reader shared a story of a coworker who he is not Facebook friends with, but suddenly when she calls he receives a bikini picture of her because it is her profile pic. (The writer of the post was kind enough to mock-up an example image rather than further embarrass the unknowing coworker).
While Facebook founder Mark Zuckerberg believes privacy is a thing of the past, how many of you want your profile pics scanned and sent to everyone's iPhones?