Looks like a cool idea but it appears to be nothing more than a public posting? When I got to the page the top line said "Chad S. pledged to buy a $100,000.00 gift card at Google in Boston."
The top post when I went to the page was:
</span> pledged to buy a -$89.00 gift card at Your moma in paris.
So looks like people are looking for web exploits.