Facebook shmacebook

I don't think I'm quite up to speed with the Facebook phenomenon which is supposedly sweeping the world. Any advice would be much appreciated.

1. I have a top friends friend request. What privileges , if any, do top friends friends get?

2. I have a Zombie request. Should I start biting chumps?

3. I have received a Shirley Temple (pink cocktail). Should I virtually drink it?

4. This is Tala. She wants to be my friend. Should I accept on the basis that it will make me look more popular? Or should I decline on the basis that I don't know who the hell she is. For all I know she could be a man, or a terrorist, or a politician. Or a male terrorist politician.