>I dont know if my friend working at Facebook believes this, or was just hiding it for me, but it's 0% chance of them doing that. Also because I never got any of these recommendations BEFORE I mentioned it out loud, which means their prediction engine (if it exists) also knows when I am going to talk about it!

He's just repeating the internal propaganda. The truth is reserved to a small team that implemented the spyware who are highly incentivized to never give any hint. Your friend doesn't work for that team.

I estimate the team size to be fewer than a dozen people. The managers above them that know about it are even fewer, with only one or two reporting to Zuck. And possibly they're so mentally retarded they don't necessarily understand it.

Don't ever install the Facebook app on your phone.