This site was recommend to me by done weisman, our CE consultant. Although the site does not have social sharing capabilities(although there is a blog), it is too useful of a tool to not mention. Zamzar is a file converter. You can take a file in one format and convert it to another format. The list of file conversions the service provides is impressive. You are limited on the file size if you use their free service, but if you find yourself needing to convert files on a regular basis, this is the way to go.