Anecdote: Two days ago, I bought some drain cleaner. I paid with a credit card. This morning, for the first time, Facebook presented me with an ad for Liquid Plumber (a drain cleaner). Without my ever giving them my credit card number, they or the attendant ad agency have cross-linked my credit card with my Facebook account. :-( This may be more noticeable to me, because Facebook on my phone is one of the few places…
Not sure what to think right now.