Facebook Messenger’s David Marcus today announced that the platform will be testing a new feature that lets you set a timer for your conversations to disappear. The feature, called “Secret Conversations,” promises to encrypt messages end-to-end from both the sender and the recipient. Users can set a timer for how long they want the messages to exist between the two parties, and will disappear completely afterward. Marcus says the feature will roll out as an optional setting for conversations that are highly sensitive, such as sharing Social Security Numbers or other confidential information over the platform. We’re not exactly sure why you’d send…

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