Posterous
Installing AddThis in your blog on Posterous is easy. This visual guide will walk you through the installation process. First be sure to Get AddThis for Posterous, then follow the steps below.
Install AddThis in Posterous
Step 1
Login to your Posterous account.
Step 2
Select your site.
Step 3
Click on Theme my site.
Step 4
Select Advanced tab from the left navigation.
Step 5
Search for {Body} in the Custom HTML code.
Step 6
Insert your AddThis code after the {Body} div closing tag: </div>
Step 7
Click on Save button.