Why is that some of the links in the first page are not working?
As always, Etherdelta will liste RVT itself and HitBTC has IOU tokens for Rivetz now. This mean HitBTC will list Rivetz too.
Please explain: What are IOU tokens? I know what 'IOU' means, but how can a token be traded on an exchange when it hasn't been released?
It's like margin trading, you sell what you don't have in your pocket. It's like you borrow something because you know its price will be dropped down, so you sell higher price and then you buy from low price to put it in there. They sell tokens now and when it hit the market they'll put it back.