Just some interesting bits of info that I remember.
My dad, now 70 years old, has 7 accounts. He created the first one on his computer, then got a phone and created a second one, not realizing he could use the same one. Then he forgot the password to the one on his computer and created a third.
Then he created one for both him AND my mom.
Then my mom created 2 accounts, for the same reason.
And on it goes.
My step-sister, now 11, created a fake account late last year just to see how it worked. She put in a woman's name and a stock photo of a woman, then forgot about it. I saw it at Christmas (6-7 months ago), and she's had close to 1,000 friend requests! Mostly men, mostly not in the US. Not a single post on the account, but so, so many men wanting to be her friend. So that's how I suspect the bot accounts work: put up a picture of a pretty woman, get a few hundred friend requests, and now you have an established account that you can use to sell likes.
Last but not least, I know that my nieces (one 17 and one 15) have 2 accounts each: one for their parents to see, and another with a fake name and location that they used to use to talk with friends privately. They doesn't use either anymore, they say that only old people use Facebook. They both now use Snapchat, so their mom can't see what they're doing.
So, 6 people in that list, including 3 minors and 1 that is below Facebook's TOS age limit, but they represent 14 accounts. And I can't imagine that there aren't a lot of other people that are just like them.
We haven't even talked about all of the fake accounts that use a real user's name and photo, then send friend requests to everyone on their list. I almost forgot about those. There's one (elderly) woman on my friend's list that clearly has a virus, and I get at least 1 friend request a week from a fake account using her name and photo.