Excerpt Showing Ad Code Instead of Relevant Content

When someone shares content using the like button, the "excerpt" is showing random ad code on the page as opposed to appropriate text. Anyone familiar with how to fix this?

Ie

College Basketball Top 50: Kentucky New #1
rnum=Math.round(Math.random() * 100000); ts=String.fromCharCode(60); if (window.self != window.top) {nf=''} else {nf='NF/'}; document.write(ts+'script src="http://www.burstnet.com/cgi-bin/ads/ad11433a.cgi/v=2.3S/sz=468x60A|728x90A/'+rnum+'/'+nf+'RETURN-CODE/JS/">'+ts+'/script>');