This summer's NSA revelations opened a lot of people's eyes. The government can (and does) surveil the American people, sometimes scooping data right off the servers of Google and Facebook. But surely Snapchat, the service that deletes all messages after they've been read, is safe? Not so much.
Snapchat just admitted in a blog post that it's handed unopened messages over to the authorities on multiple occasions in the past year or so. Snaps that have been opened are deleted and unretrievable, but the unopened messages remain on the company's servers—which are run by Google—for 30 days. "Since May 2013, about a dozen of the search warrants we've received have resulted in us producing unopened Snaps to law enforcement," Micah Schaffer, Snapchat's head of trust and safety, explains. "That's out of 350 million Snaps sent every day."
So this is a very rare occurrence. In fact, it looks like Snapchat hands user data over to the authorities much less than Facebook, Google and Yahoo, all of whom issue semi-annual transparency reports detailing their dealings with authorities. It's worth noting that these companies do hold back some information about user data requests due some anti-terrorism laws, though they're working on getting those laws changed.