I was always taught nothing in life is free. I guess I always assumed the advertising is their revenue for the FREE service. When an ad pops up for something you just searched, just like any other site I would guess that’s the internet logging your info and I think thats great. If you voluntarily enter a bunch of personal information on the INTERNET you would be stupid to think it’s not going to be seen by everyone, don’t put it on the web maybe??? Logic!
Just like anything you sign up for to win Free prizes, they sell that info, so I simply don’t sign up for FREE* stuff very often.
I also quit FB long ago anyways.