What are the benefits of signing up with ShareThis? Here are a few to wet your whistle:
You can create a ShareThis account at http://www.sharethis.com/register by simply providing your email and choosing a password to login later on.
Using ShareThis in combination with this Add-On (Please ShareThis), will make it super-easy to change what is displayed. Drag/drop the services you want, (re)order them the way you want and nothing else to worry about. In case a code change will happen for ShareThis, this Add-On will automatically update your code. So no copy/paste actions required by you as site owner!