If you were to purchase 1,000 Facebook credits, you would have to pay $1,000. Scammers are promising free 1,000 or 2,000 credits if you click on the page they provide.
Using fake testimonials, they lure people into clicking on three-four consecutive pages and fill some surveys. That is the trick. They are getting paid as affiliates to have those surveys done. Indeed, at the end of the survey, there are no free points, either.
How to avoid: we know you like freebies, but don’t raise your hopes over free Internet stuff. Report the scammers to Facebook admin.