hi
your code
<!-- AddThis Button BEGIN -->
<div class="addthis_toolbox addthis_default_style ">
<a class="addthis_button_facebook_like" fb:like:layout="button_count"></a>
<a class="addthis_button_tweet"></a>
<a class="addthis_button_google_plusone" g:plusone:size="medium"></a>
<a class="addthis_counter addthis_pill_style"></a>
</div>
<script type="text/javascript" src="http://s7.addthis.com/js/250/addthis_widget.js#pubid=ra-4f098cb874333cd3"></script>
<!-- AddThis Button END -->
could not run at my site.
in vs2010,build and run the page which include your addthis button above.
the error is in the line.
<a class="addthis_button_facebook_like" fb:like:layout="button_count"></a>
pls check them.