"the man had deleted all of his Facebook data. A huge pain and shame"
Indeed, the shame being he should have deleted it himself!
Even if keeping on FB then please delete and create a new profile with a new disposable email every year or so. It limits what FB can easily gather on you and evidence of past indiscretions, and a perfect excuse to dump those "friends" who are sufficiently important not to appear to single out for un-friending, but that you really did not want watching your every post.
Edited to add: And don't give FB your email log-in password or mobile number, mkay?