Through December 14th, invite 5 friends to join StumbleUpon, a FREE site that helps you discover interesting web pages, photos and videos recommended by friends, and you’ll score yourself a FREE $10 Amazon gift card!

Here's how to get your freebie:

* Go here and sign up for StumbleUpon… it’s FREE!

* After signing up, go here to start sharing this offer with at least 5 friends. You can do so via Facebook, Twitter or by sending emails to friends and family.

* Once a friend signs up (under your link) you will receive an email confirmation that states “Congratulations, one of your friends has signed up for StumbleUpon” . And once you receive 5 of these emails, you will have earned your gift card!