Facebook friends help? hacked?

[Anna]

So I go on my Facebook often. I checked my friends list and it was 1149. The time I checked it was around 3 days ago. Now that I just went on it said 1252. I was thinking to myself jdldgwofjeif. I have no clue what happened! I didn't friend request anyone and all of a sudden I got 100 extra friends in like 2-3 days! I checked my security in the accounts tab and everything is set to maximum protection like it use to be, I did this like 4 months ago. So if someone tried to get in my Facebook account, a text would be sent to my phone. And I didn't get any so I'm not sure if this was a hack to my friends. But I have no clue what it is and can someone please explain to me what is going on! Thank you so much!