You're not surprised by this? In spite of all the talk in the article about how this was "not that easy" the real reason probably lies in this bit near the end:<p><i>"Why can’t Facebook just stop collecting your browsing history entirely? Well, it could, but a large part of Facebook’s business depends on collecting this kind of browsing data, so it would cripple a big revenue stream."</i><p>As long as Facebook's business model involves monetizing your data, they are going to slow walk any feature that might impact this.