Somebody named Lex Truthor had the best ones:
How to suck on Facebook:
1. Repost inane "repost this" status updates.
2. Post political rants.
3. Use your children's pictures as your profile pic. Guess what? You care more about your kids than anyone else on your list.
4. Tag photos. Especially the embarrassing ones.
5. Reply to friends of your friends telling them how much they suck for not sharing your viewpoint.
6. Create awkward moments by sending friend requests to your exes.
7. "Like" every band, book, article, you come across so everyone on your list gets spammed with junk only you care about.
8. Post every single personal revelation in your life. "I can't live for everyone else anymore. I need to live for myself." Save it for your therapist.
9. Complain about your job. Everyone loves a complainer.
10. Repeatedly invite all your friends to play Xanga games. People love that the only time they hear from you is when you want a referral prize from Farmville.