What kind of services can be submitted?
AddThis can support any destination or service which accepts links passed with a URL, such as: http://facebook.com/share.php?u=addthis.com
This includes sites such as social networks, blogging platforms and other social destinations that have been configured to allow visitors to post links and other media.
I have AddThis on my Firefox for Linux and love it! This is so you can add a service they don't already have.