Based on what (little) you know about them.
Pigfoot_ - newspaper reporter. Undercovering scum across the nation and humiliating them publicly.
Chris_is_cool - children's entertainer.
Whiterussian - school mistress. Headmistress probs.
Alex-in-Ciderland - fast food critic.
Klaire - head of some sort of animal rights/protection society.
KissinginKansas - professional sofa tester.
Pocketmouse - some crazy food hygiene expert.
ummm that's it, I'm out of ideas for now.