Chat Heads & privacy

I quite liked the chat head feature like they have on the android version, but they dont have chat heads for iOS :( which is ultra lame. I hate having to exit out of whatever app Im using to go to Messenger to message someone back.
Its also pretty wack that there are times that a friend and I will be video chatting, and after we hang up, Ill be scrolling through my Facebook home page and Ill see an ad from another company trying to advertise something my friend and I were just speaking about. They listen for key words in your convos, and sell your information to companies so they can target certain people with different ads. You have little to no privacy on here.

rachhhaeellll about Messenger, v129.0