If you mainly want to share posts, I can recommend another services to use in place of Share This. If you add a dynamic footer bar to your site, your visitors will be able to share your post with a number services such as Twitter, Digg, Facebook, etc. Plus there are a number of other useful tools in the bar.
An example of the kind of bar I'm talking about can be found at the bottom of this site: http://poeticapricot.wildapricot.org/ - as you can see, when you visits a blog post, you can click on the Share button in the footer bar to share it in multiple ways. The bar can also be easily customized and changed without coding knowledge.
The one on that site can be acquired for free from http://www.wibiya.com/
There are many other companies with similar bars, such as http://bar.meebo.com/
Matthieu (Ex-Apricot)
Please contact support directly for assistance on any of my posts as I will no longer be checking these forums: support@wildapricot.com