I have to say that I don't really have any complaints about FB except one making it a really good, fun app in my opinion. I get on FB anywhere from 3-4 times a week and I pretty much always enjoy my time spent on there. I'm part of several groups which liven FB up and make it more interesting. I have also made some really great friends on FB and for that I am very grateful!
My only complaint is that as of recently, while I'm on FB out of nowhere I'll get a flashing message saying that I've timed out and then FB logs me out automatically. This is a major pain because I never remember my password, therefore I have to go through several steps to verify I'm me and be able to log back on. Once I'm back on, I am temporarily blocked from using my emotion button, leaving messages for anyone and responding to any messages in my feed. This is a huge problem and idk how to get help from FB to fix the situation. Other than that I have no complaints about FB, only good things to say.
It's a great place to make new friends, socialize with all of your friends, and just relax and have fun!