Fix for using the -actual- url

Currently the url of your site is grabbed internally from drupal and results in urls like:
http://example.com/node/1

instead of:

http://example.com/interesting-post

Find this code in addthis.module:

if(variable_get('clean_url','0')==0)
$link_url = $base_url.'/?q='.$_GET['q'];
else
$link_url = $base_url.'/'.$_GET['q'];

and replace with:

$link_url = $base_url . $_SERVER['REQUEST_URI'];