I'm still stumbling my way around Facebook and learning mainly by taste. Being added as a vampire, zombie or STD is plain annoying so there'll be less of that. Watching how smart people use Facebook seems to be the way to go. Take Chris Brogan's Grasshopper group, for example:

Facebook isn’t just a school toy or “yet another social network.” From what I’m learning, it’s a pretty useful system that can be used very effectively to build a very vibrant network, provide excellent tools (especially with lots of good 3rd party apps), and then provide you the chance to use it to DO SOMETHING. I believe that Grasshoppers is a great way to prove this. Join the group. Determine what we’re doing and how you can apply yourself to it. And then dig in. Turn social networking into action.

Thats a jawdropping idea. Especially seeing as so many people seem to use it for nothing more powerful than sharing photos of old school friends ie. a dusty box best left under your fucking bed. PS