I did some accidental market research on Snap with my girlfriend's 9 year-old cousin this weekend.<p>She had tons of snaps, but informed me that they were almost all blank images. She and her friends send each other these blank images to maintain 'streaks,' which count the number of continuous days that two people have messaged each other.<p>So attached to these streaks were the cousin and her friends that if the 24 hour mark was approaching and the cousin hadn't sent a blank message to her longest streak, the counterparty would log-in to the cousin's snapchat and send _herself_ a message, to make sure the streak continued.<p>My cousin said that the blowup in (blank) picture messages had slowed the app to a crawl, leading her not to use it anymore, aside of course for streaks.<p>Not the kind of of daily-active-users that advertisers crave. I'm 28; never heard of streaks before this.