Having said that, if you look at a genuine result from twitter: http://images.google.com/imgres?imgurl=http://a1.twimg.com/profile_images/108462666/home_sscred

Having said that, if you look at a genuine result from twitter: http://images.google.com/imgres?imgurl=http://a1.twimg.com/profile_images/108462666/home_sscredits_bigger.jpg&imgrefurl=http://twitter.com/homeproject&usg=__gzb2ICTasTI-R6GrhHpOIfNxoVs=&h=3780&w=2835&sz=442&hl=en&start=1&itbs=1&tbnid=_uftMx2399b4tM:&tbnh=150&tbnw=113&prev=/images%3Fq%3Dsite:twitter.com%26hl%3Den%26gbv%3D2%26tbs%3Disch:1 http://images.google.com/imgres?imgurl=http://a1.twimg.com/p... google doesn't detect or stop that breaking out of frames. But maybe twitter are just managing to avoid detection by google's code.. The code on that page is: <script type="text/javascript"> //<![CDATA[ if (window.top !== window.self) {document.write = "";window.top.location = window.self.location; setTimeout(function(){document.body.innerHTML='';},1);window.self.onload=function(evt){document.body.innerHTML='';};} //]]> </script> which doesn't seem like it would be too hard to detect.