I saw this in my rss feed and figured Id share it:
Amazon offers a $5 off $25 Amazon credit for free when you answer a question and post it to your Facebook page. (The credit will then be applied automatically to your Amazon account.) That's tied with our mention from two weeks ago as the largest such credit we've seen from Amazon. Limit one per person. Credit expires December 9.
Checked the fine print and doesn't work on digital products.