I gave the URL (http://thinkabit.wordpress.com/feed/atom) for my feed to the W3C RSS validator and it give me this warning: Unregistered link relationship: search. From what I gather from other forum posts, this indicates a problem with a setting for the theme I am using (Contempt).
What I really am trying to do is to get Facebook to once again start updating my notes from my feed. I am only guessing that this warning may be why it isn't.