One of our biggest tools in our social media arsonal is this little guy:
AddThis automatically optimizes itself for each person who visits your site. Every person shares differently, so AddThis custom fits each menu with the services they'll normally use. For example, if a user shares to Facebook and Amazon Wishlist, they will be presented with those first. Also, if a user is sharing from an iPhone, AddThis provides an alternate interface. This logic ensures that your content is always one click away, because the right service is always tailored to the right person.
Your content can now be shared to more services than ever before. Popular sites like Facebook, Twitter, and Digg... Sites popular in other countries like Meneame, Hatena, and NUjij... and even new utilities like Instapaper, Google Translate, and PDFthis. The best part is, the AddThis Service Directory is growing and automatically helps to keep your sharing tools up-to-date with these new services, so you don't have to.