facebook users, people know what you see. that's the front end. a lot of this goes to the back end, right? data, meta data, any information that might have identifying aspects to it. based on your tech expertise, i mean, deepa, do you think this is the kind of information to give mueller clues he wouldn't be able to get from anyone other than facebook? >> absolutely. i mean, only facebook has copies of the ads themselves. only they know or who the buyers are and able to match that with the ad copy. they have access to the -- you know, to the reach of a particular ad so they could tell how effective it was and who shared it and there are a lot -- enormous number of details only facebook has and keep it private. you know in that is a big part of the company's e thos. they don't like to share advertiser data which makes it a little difficult for all of us