I still hear lots of people moaning about the random application invites they receive from friends on Facebook.  A few months ago Facebook provided opt-out capabilities for applications.  What that means is that if you are fed up of receiving random requests you can now click the “Block This Application” link to never see that application again, or if you have a friend who’s particularly aggressive with the invites, you can also hit the “Ignore All Invites From This Friend.”