Thing on Facebook that is incredibly weird: a profile photo of you, in your wedding dress, standing next to your dad. Putting that on Facebook is fine. Having it as your profile is creepy. I am unsure if that's groom or parent.
Thing on Facebook that is terribly good: all you people who have not set up your privacy settings! I love to see a person from high school who tortured me and is now fat and living in Idaho! I am terribly mean, it's true, but it's also true that you should set up privacy settings if you do not want to be on the receiving end of such schadenfreude. Privacy settings are good even if you were nice in high school, and no matter how thin you may be or far from Idaho may you live now.
Thing on Facebook that is terribly bad: the people who I am friends with that prompt a reaction in me of utter negativity. Whether it is an ex or an acquaintance that I can't seem to de-friend or someone who uses it solely for self-promotion and never, ever, has a dialogue, I manage to seek them out when I am feeling blue and trolling their profile just immediately turns my azure into navy. Boo. When will I learn to stay away?