I would like to share my experience here because I think it was creepy on their part.
I only had <50 friends after 2015 on my facebook account. So, I would get notifications 1-2 times every week, "X is new to facebook, Since he is new to facebook, You should introduce him to more friends", Problem is,
1. I have no clue who X is! Sometimes I found that X lived in the same city that I lived in, Sometimes there was no visible co-relation.
2. X was automatically added to my friends list without my permission!
On several occassions, There were some people who were added as my friend but I couldn't find them on my friends list. The only way I figured they were my friends was when I received a notification and then visited their profile.
On 5-10 occassions every month, facebook will randomly send friend requests to people I don't even know and then some day I am just browsing and I get a notification that "Y has accepted your friend request" and I just couldn't recall sending friend request to that person.
So, Yeah, They were literally forcing me to be friends with people I don't even know, presumably, because I never clicked on ads and if I have less friends, That just means there is little activity in my circle and there is little information they can collect about me, IDK.
Whenever this happened, I usually took a screenshot, It probably doesn't do a solid job of proving my claim but it's something.
And before someone here starts running down a list of possible things that might have happened, Like someone hacked into my account, apps that had access to my account etc. I just want to say, I was a member of official 2600 magzine group, I posted all of this multiple times there and they did helped me a lot to prevent me from a lot of ways that someone might be accessing my account. I followed everything and it 6 months later it still didn't stop.