Another good reminder from Jason Kincaid at TechCrunch that an opt-in feature on Facebook doesn’t really mean “no unless otherwise indicated.” It really means “Select One” which is Facebook-speak for “yes until you formally decline.” That kind of sounds like an opt-out to me but what do I know – I’m just a regular person who obviously missed the email that everyday at Facebook is opposite day.
Account tab > Privacy Settings > Things Others Share: Enable or Disable.