imagetwist.com legit?

I think that it is legitimate, however, DO make sure that you read the Terms of Service: http://imagetwist.com/tos.html carefully and abide by them. If you don't - and they will certainly check your account thoroughly when you request payment - you are very liable to be banned and not be paid at all. Use it legitimately and they will very likely pay you legitimately. The site has been around for three years (at least) and I see few complaints that it is a scam.

I use it sometimes, I hear that it is legit but still dont know if it is, I am not using to earn just to upload some of my photo there, I also want to know if it is paying