I've registered with a file sharing site (Imesh) so that l can download music. Everything appears to be fine and dandy (although it's search engine keeps trying to gazump google).

I have downloaded lots of music but as far as l'm aware l haven't uploaded any of mine.

Do my music file get uploaded automatically? It hasn't asked me to upload anything so it appears that l'm getting a great deal without contributing anything.

How do these sites pay for themselves?

They dont pay for themselves,,,,tthe adverts on them normaly do,,,,u can choose to share your files,,,in your imesh options ,,,somewere u will find the option to share,,,,however,,,i have been downloadng music for 5 years and have never shared anything,i also use a program called LIMEWIRE,,,,this is the best and fastest program ive used and neva had a problem,,,good luck

i find mininova the best for downloading albums anyway

http://www.mininova.org/

u need a bitlord torrant

but u can get any album on there even bsides
i got loads of oasis albums of there that havent even been in the shops its ace