That's how I see it.
I have a FB account. I don't have "friends," though. I don't put my life online. I have a FB account because I needed one to participate in a couple of groups (a cord cutting group, a lost pets local group, follow my state reps, and a gardening group, and such).
I pay no attention to FB ads. Why would I? I don't get political information from FB...except the abhorrent red info posted by my red reps.
If there's information I'm interested in that I see on FB, I go to the SOURCE. I NEVER cite FB. FB is NOT a news organization. It's a bulletin board.
So it's up to people to be encouraged, discouraged, incited, invited to believe a certain way or join a nefarious group.
FB IS responsible for selling data, not blocking hate speech or incitements to violence and such. It is now doing so, it SAYS. So it needs to do that.
Also, people need to be aware that other people try to persuade them toward their own views, or different views. Personally, I can't be persuaded, I think, to hate anyone that I don't already hate. Or dislike a political position that I don't already dislike. I believe the science that says there is climate change. No one can persuade me otherwise. I go to main sources for my information, not persuasive posts.
Many people are already inclined toward one thing or another, so it may be easy to push them over the ledge. I mean, what idiot would possibly believe that Hillary Clinton had a child sex ring or whatever under a pizza parlor in NY? Anyone who would believe that ALREADY believed some weird things about her, and hated her. (I suspect most knew it wasn't true, but they enjoyed the story and hopefully getting under the skins of "libs".)
I've even seen a post or two in DU, where the poster posts something from FB as information, instead of going to the real source of the information. FB is NOT a news organization or a source of valid information. If there is valid information, it will have a link to the source, so you can go to that. If you go to that, and it is merely another link to an unidentified source (which has happened to me)....guess what? It's not real.