In reply to EricpAndrew:
not sure how you stand on equal opps with this, equal opps forms are kept private so they can't be unconsciosly used in the recruitment process. Wouldn't be great if you found out their age, sexuality, marital status, ethnic background, religion etc through facebook would it?
also, if someone's having a running battle with someone online over something, frankly it may be of no relevance to the job, but would knowing about it influence your decision to employ them?
I really don't know the answer to this, but these were the things I thought of when I saw your post.