New York Post: Snapchat is all about sharing — except when it comes to advertisers. The self-destructing messaging app, which is especially popular with young people, is ready to make money off its more than 100 million users worldwide. But while the social media company talks about its big user base, it isn’t providing independent data that show how many people are really using the service. “They are still a fairly young company, and our challenge with them is that their data is all first-party.”