Amazon launched a new Associates feature called “Share on Twitter,” that allows you sharing your links with Twitter. All by simply log in to Amazon Associates account, visit any detail page on Amazon.com. Click ‘Share on Twitter’ button in Site Stripe, a window will open with pre populated message ‘What are you doing?’ text area of your Twitter account, and will include a shortened URL with your Amazon Associates ID. You can edit this message or simply hit ‘Update’ button to post to your Twitter account. When Twitter users click on link in your post and make a qualifying sale, you’ll earn referral fees.
More info: Social Media FAQ