So a friend of mine recently got a new job at a large company. He posted this on facebook. Facebook read this, and offered me a link to buy him a gift. The even creepier part is that it wasn't a link to any specific retailer, it would have made far more sense if they were shilling out a sponsor to me. Nope. They just wanted to leave me a message that said "Hey, while probing your inputs for marketable information, we noticed your friend had a special occasion. Don't you think you should buy him a gift?"
It read to me as"Hey, I have a hidden camera in your bathroom, and I just wanted to say you're not flossing correctly. You're supposed to cup the tooth in a c shape."