Edit in JSFiddle

<script type="text/javascript" src="https://apis.google.com/js/plusone.js">
    {google_analytics: false}
</script>

<g:plusone callback='MyTrackSocial' href="http://www.example.com"></g:plusone> 
window.MyTrackSocial = function(a){
    if (a.state === 'on'){
        _gaq.push(['_trackEvent', 'Social', a.href, '+1']);
    }
}


var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-XXXXXXX-1']);
_gaq.push(['_trackPageview']);

(function() {
var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();