information fiduciary enshrined in statute. >> senator it's certainly an interesting idea. and jack is very thoughtful in this space so i do think it deserves consideration. >> thank you. >> thank you, mr. chairman. thank you mr. zuckerberg for being here today. i appreciate your testimony. the full scope of facebook users' activity can print very personal picture, i think. and additionally you have those two billion users that are out there every month. and so we all know that's larger than the population of most countries. how many data categories do you store, does facebook store? on the categories that you collect? >> senator, can you clarify what you mean by data categories? >> there are some past reports that have been out there that indicate that facebook collects about 96