Is this an exploit or what?

I was reviewing my web stats and noticed 3 or 4 hits in the last 2 days from widgets.wordpress.com although I cant find anywhere on that site where there is a link to my site.

When i go to widgets.wordpress.com and view the page source I see the following javascript code inside their source:

<script type="text/javascript">
function showNav(el) { el.getElementsByTagName('UL')[0].style.left='auto'; }
function hideNav(el) { el.getElementsByTagName('UL')[0].style.left='-999em'; }
function pressthis(step) {if (step == 1) {if(navigator.userAgent.indexOf('Safari') >= 0) {Q=getSelection();}else {if(window.getSelection)Q=window.getSelection().toString();else if(document.selection)Q=document.selection.createRange().text;else Q=document.getSelection().toString();}} else {location.href='https://domain.com/wp-admin/post-new.php?text='+encodeURIComponent(Q.toString())+'&amp;popupurl='+encodeURIComponent(location.href)+'&amp;popuptitle='+encodeURIComponent(document.title);}}
</script>

Why is there javascript in someone elses website trying to post in my admin section? I replaced my domain with “domain.com” in the location.href .

any helpwould be appreciated