Here are the acceptable ways to determine if an opportunity is an Online Fraud or Scam:
1. Unbelievable testimonials that you can't check. Most of these will list something like: "D.G. San Francisco" and not give an address, email, or phone. Even if they do (a rare occurrence), these may be phony email addresses that go directly to the website owner.
2. Pressure to buy now or very soon. If you see something like "$20 for the next two hours, after that the price will go back up to $40", just come back the next day. You'll see the same message.
3. You try to click away from the site and you'll get a pop up saying that they will give you the "success kit" for half price. Is that really what it's worth? Maybe even less?
4. Any site that uses pop unders. You'll click away from the site, only to find an offer that has nothing to do with what you were just looking at. The hope is that you will be curious enough to click through and earn that affiliate a small "visitor" fee.
5. Any rags to riches story..."I was an unemployed waiter and hadn't worked in 6 months. Then I stumbled upon..." Yeah, right!
6. The old "do what I do" pyramid scheme, where the only product being sold is signups.
You'll eventually find there absolutely no tangible product or service.
Note that accepted online businesses clearly show what is offered online. Do your due homework and you will not regret spending time and money on a wasted effort.