They blocked Twicsy today too, for using a pretty reputable ad network. It seems anti-competitive to me. Google knows it is an ad network that is causing the problems, they even pointed me to the supposedly malicious script. If they know that, they can just disable the ad network and send me a notice on Google Webmaster tools. They did neither, instead they block Twicsy for everyone and display a nasty message. It is ridiculous.