The piece I find most interesting about this is what isn't there. For example, what pages or friends did the user look at, without posting or sending messages

The piece I find most interesting about this is what isn't there. For example, what pages or friends did the user look at, without posting or sending messages to? That there isn't the entire 'browsing' history is either a sign that Facebook didn't hand over as much as they actually have or that they aren't tracking it. My bet would be on the former, so kudos to Facebook?