What Facebook is doing is quite frankly scary. This Sunday over a birthday meeting with some friends, one of them was telling us about a restaurant called "Lucuma" (this is in Guadalajara, Mexico). My wife did nothing with her cell-phone, except having it with her during the conversation.

Later that day when we are back at home, she showed me an ad about that same restaurant. We never searched for something similar (this is a vegan restaurant), but only talked about it on our way home.