How do you know if the site is a scam or not?

use WOT. WOT stand for Web Of Trust. It is a free service which encompasses a map of most of the websites in the world and rates them. It is a database of ratings given to websites. You can install an addon for your browser (firefox or IE or any other) and that addon will check each website you visit and provide you with ratings on various items such as, privacy, trust, worthiness, child safe, spyware safe, etc. If it finds out that the website you are visiting if fraudulent then it will give you a suggestion not to visit the site. You can either ignore or respect that suggestion. www.mywot.com

check it with the business bureau...

If no street address is given, it's probably a scam. Always be careful of sites that want your money. Because I've been a victim of scamming, I now check with the BBB before I have anything to do with a particular site. Don't trust any of them until you've done a thorough research on the site.

well if it sounds too good to be true its often a scam ,but what i do often is sign up find out what the payout is be a memeber for a month or how long it takes to be paid then if i get paid it isnt if it doesnt it is and il put it up here as a discussion. which ones have you joined? the ones which arent scams are mylot,pickjack,slicethepie.com, and there are some on my profile page where i have banners have a look and join some most of them are genuine.When i find out one isnt i take it off my profile page.