I have one account, why should I have more? I went on a holiday and when I came back, I could not get access to my friends anymore. Facebook asked me to recognise some friends I've never seen before to get access to my account. Since then I don't like face book any more.... If you want to make new friends, Facebook ask you whether you know the person. You can't make friends through friends anymore..!
I have 2 and should probably get more and start gathering friends just In case I can use it in the future.
I've got 3 accounts, one personal and two for collecting game stuff. Wish I'd never started those games!!!! lol.