I was wondering if anyone has seen/tried any of these websites and know if they are scams?

(There's probably more like these).

They offer an iPhone for completing 3 offers or an iPhone + $500 cash for 4 offers. That seems like a pretty big gift for only 4 offers. Also the websites seem kind of sketchy, with dead links here and there and a weird gift status system (clicking "gift status" takes you to a page with the admin's email).

Finally, there's this.