I've noticed that today too. I recieved three credit card ads one right after the other with only 2 or 3 posts in between. I'm not sure if it's because I just ordered a bitcoin mastercard from wirex but it really is annoying. If I wanted a credit card, or anything else they could possibly make an ad for, I'd go get it because I wanted it. I certainly wouldn't impulse buy a credit card because I saw an ad on Facebook telling me I need one.