The first big new tool is a user tool called Clear History. You can see information gathered from Facebook integration onto other sites, including apps and websites that use Facebook's ads. Zuckerberg says "we're building this," but doesn't offer a date for it to roll out. He does, however, say that you can turn off that tracking forever once you clear it. It will be limited at first. Gut reaction is that this is a little unclear about whether or not this is all the data Facebook has about you.