Five hours ago, Reddit published its 2015 edition, which contains no mention of classified requests for user information.

"Warrant canaries" are a response to the practice by governments of serving warrants on service providers that include gag orders forbidding the service from disclosing the warrant's existence. By publishing regular transparency reports listing the number of secret warrants received to date as "0," then omitting the section dealing with those warrants once the first warrant has been served, companies can create a kind of dead man's switch -- done right, it might even stop governments from even trying to serve a warrant (except in Australia, where warrant canaries are illegal).