Facebook has had a few security and privacy related incidents of late, with the newest one to come to light being that the Facebook for Android app sent your phone number back to Facebook's servers even if you didn't log in or didn't have an account. Facebook has said that all of these numbers have been deleted, but it still makes you wonder why they were ever collected in the first place.
The "bug," as Facebook calls it, was in the beta application that Facebook released yesterday. That bug has since been patched and Facebook has stated that the accidentally logged numbers have all been cleared from their servers. The bug came to light thanks to security firm Symantec. According to their researchers, a user's phone number would be sent to Facebook immediately upon opening the app.
It's unclear how many users were affected. This bug does not appear to be related to the other recent privacy snafu at Facebook. Still, you've got to wonder if this was something similar to the Google Street View Wi-Fi snooping issue that was settled not too long ago.