Sync gives you free space simply by referring your friends! You’ll get an extra 1GB for every friend you refer (and your friend will get a extra 1GB too).
Here’s how it works:
1. Log in to the web panel.
2. Click your Account Name at the top right corner of the screen.
3. Click Account Settings.
4. Click on the Rewards tab.
5. Copy the referral link and send it to your friends and family, post it on your Blog, or spread the message through Twitter. Each time someone clicks on your link and signs up for Sync you’ll get an additional 1GB of space (and so will they).
6. The link is completely anonymous. When someone clicks on your link they have 30 days to sign up.
Note: There is a 20GB referral limit