Slavery is illegal. However, are you using slavery as an alternative term for low paying, tedious jobs? If so, you can find small, mindless jobs at places like Amazon Mechanical Turk.
Data Entry jobs are also quite grueling. Find some at oDesk
second life
foopets.com
Yes, there are. Such websites as SimCountry, Cyber Nation and NationStates are good virtual world websites.
imvu.comhabbohotel.comourworld.comevony.comhope they help!
yes
minecraft
moshi monsters, hwrose, bellasara,
yes babydow its alot of fun
Floorplanner
There are many Harry Potter RPGS (virtual games) out there. All you need to do is preform a search.
Virtual Staff Finder. Fiverr. Upwork. HelloRache. Fancy Hands. TaskRabbit. Vasumo. VaVa Virtual.
clupenguin.com fantage.com and more :)