The knock on Snapchat of late is that it’s not secure. That’s a largely fair complaint about the service, which has given up plenty of data to hackers, even though it’s meant as a ephemeral service that keeps nothing. Snapchat blamed third-party apps for the vulnerability, and today have taken the first steps toward securing their platform. Or at least educating users on the difference between Snapchat and a third-party app. In a bold move, Snapchat is actively asking users to stop using those off-brand apps.