My mother uses Google every day. She'll do a search for the bylaws for her municipality. Or she'll search for ingredient substitutions in a recipe she's reading. She's got a toe dipped into the Twitter ocean. She'll click on the odd thing on Twitter to read a thread posted by her local councillor, or something by a comedian she likes. She's even shown me cat memes from Reddit!
But where were the bylaws being discussed, such that she wanted to look them up? Where did she find that recipe in the first place? Where did she hear about something written by her city councillor? Where did she see a link to a video clip on Reddit or Twitter?
On Facebook, of course. She's generally aware that big tech is turning our society into a surveillance-consumption dystopia. And it's obvious how central Facebook is to this. More obvious than Google. Facebook is the first page she loads every time she gets on the computer. It sends her notifications on her tablet. She has an account on Facebook -- almost everyone here does. She doesn't have a Twitter or Reddit account. Just passive drive-by reading.
Facebook is the central pillar from her perspective. It's obviously heavily personalized content. You basically have to be logged in to use it. It's very obvious to see how they could manipulate you by selecting which messages and news stories you see on your personalized feed. Facebook might as well be the Internet for some people. So Facebook draws the ire. By comparison, Google and their ads, and their trackers, are under the surface, in the background, operating largely unseen by many. (Many people also seem to be unaware Google owns Youtube, oddly.)