How can I put AddThis in a WordPress.com blog?

You can install AddThis into the WordPress.com sidebar, and/or at the end of each post. More information and installation instructions

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General Topics

Getting Started
Plugins for Blogs & CMS
Customizing AddThis
Buttons & Counters
Analytics
Accounts & Settings
Sharing Tools and Toolbars
 

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API and SDK Overview
Client API
Welcome Bar API
Trending Content Box API
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Analytics API
Sharing Endpoints
Services API
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