As of January 1 2012, people who use Selective Twitter to update their Facebook status may be exposing their Twitter IDs. While not a problem for some, those who desire to keep a modicum of anonymity between the two communities might find this disconcerting.The fix is very simple – go to https://apps.facebook.com/selectivetwitter/settings and untick "Include a link to your twitter profile below each update?" This will prevent the behavior going forward.Additionally, you can go and hide previous posts from January 1st on forward by going to the "All Activity" section of your Facebook page. To access this, simply replace "YOUR_USERNAME" with your Facebook ID:To hide the post utilize the furthest icon on the right of each activity entry. It should allow you to choose "Featured on Timeline", "Allowed on Timeline" and "Hidden from Timeline". Choose the latter to hide the affected posts.