I was getting nothing and then figured that the addEventListener
was probably firing before the object was in place, so I wrapped it in a $(document).ready()
<script type="text/javascript">
// Alert a message when the user shares somewhere
function shareEventHandler(evt) {
//console.log(evt); // look in the browser for the object details
alert(evt.data.service);
}
$(document).ready(function(){
addthis.addEventListener('addthis.menu.share', shareEventHandler);
});
</script>