An encrypted messaging app that allows users to delete their texts automatically after just a few seconds has become a favored way of communicating among some San Francisco supervisors and their aides, raising questions about whether technological advances are subverting public-records laws.
The app, Telegram, was created by a Russian entrepreneur and claims to be 100 percent encrypted. It is one of several apps, including Snapchat, Wickr and Frankly, that offer self-destructing messages.
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