I'd like to add "via @pamdyer" at the end of tweets. How do I go about doing that? Site is www.pamorama.net.
In order to add Twitter attribution to the Tweet button you have to configure it inside the button. Use the custom button option in the AddThis and modify the Tweet button to add the tw:via parameter, like this:
<a class="addthis_button_tweet" tw:via="YOUR USERNAME"></a>
Replace YOUR USERNAME with your Twitter username
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