I think people have the wrong idea about what it's doing when it's turned on. First off it's not sending any local file info to bing to scan and push ads to you, all it does is pass the search term you type in the search field over to Bing at the same time. It's basically doing two searches at once and giving you the results in one place, the search pane. The search pane doesn't show you ads either, it shows you links. You only see ads when you bring up the new Smart Search "app", if you click on one of the top results to a local file or control panel/pc settings area of the OS then you don't see ads. Besides, you can turn it off, if it really bugs you. I bet the majority won't care though, the general computing public doesn't think twice about sharing their info online to some service as we've seen.