On IE7 code below
<a class="addthis_button_google_plusone" g:plusone:size="medium"></a>
is not displaying a google plus counter.
On all other browsers it is working fine.
Google ended support for IE7 on August 1, 2011 - http://www.computerworld.com/s/article/9217279/Google_to_dump_support_for_Microsoft_s_IE7 - so Google+ isn't supported by that browser.
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