I would be hesitant to wonder about the data on Snapchat and what it provides. Think of how the app works: You take a picture, add a caption, and draw on the picture if you please. Then you select friends to send it to and you're done. That can be accomplished in < 30 seconds. Viewing snaps sent from friends is at MAX 10 seconds per snap. Unless a user is sending and receiving a lot of snaps, I would doubt they reach ' used regularly (defined by several hours per week or more, multiple answers OK)' threshold.
Thinly veiled, Snapchat is for sending nudes. In that sense I suppose it's more incentive to send photos, given the premise that the photos won't be seen by a third party.
