You can make $10 in 20 mins by doing this:

1) Sign up here - http://oneclass.com/a/587706 - make sure you use that link.
2) Make sure you select the option "I'm also interested in uploading my notes and make money".
3) Refer yourself through a VPN or Tor browser using different emails every time(it takes exactly 16 referrals for you to make $10).
4) Enjoy the free giftcards.