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.