I was about to delete my account in FB because of absolutely annoying ads and spam! Fortunately, I've found the ad blocker for FB. At least 70% spam is out! It's great! Incredible! Thanks, bro! I use Firefox under Linux Mint.
P.S. Sometimes the AdBlocker stops filtering, so I switch it off in my browser setting add-ons, log off FB, then switch AdBlocker on again and log on FB. After that it works well again.