Pop up ads in Orkut

I saw a pop up ad in Orkut today. This ad is served by an OpenSocial application. There are many OpenSocial applications which serve text ads, but the one I encountered today is a pop up. I hate pop up ads and so others also. This ad is invoked by a JavaScript, which runs by the OpenSource application. And some application can have malicious script, which can be dangerous. So be careful while adding a new OpenSocial application to your profile.