Make use of the Magento order success page to promote your products. This module adds lists each product in an order with product name, product image, facebook icon and twitter icon.
The Facebook link uses Facebook’s sharer.php functionality (http://wiki.developers.facebook.com/index.php/Facebook_Share), the twitter link opens up a twitter page with the following in the status box ready to be posted:
"I just bought a $productname from $shopname. $product_url"
The standard Facebook and Twitter buttons are used, including counters. Or, optionally, use icons made from CSS3, no images.
To download the module please visit the module’s page on Magento Connect