I'm rather surprised--which is to say, calling bullshit--that no porn sites (any of the $TUBE network) shows up on this.
Of course, I'm sure if the NSA put its mind to it (not happening), they could get a fairly accurate readout of the most popular sites for the US...
Another option for conspiracy theorists is to just get data from apache logs etc., because, you know, NSA has access to everything.
Also I found interesting gay porn seemed to be very over represented on mobile internet, about 20%-ish of top porn sites. I found this interesting as in a male world you would expect this to be about 10% so it seemed either gay males watch much more porn or as I assumed, guys would have a look on their phones as this was more private to have a curiosity look...??