The video is grainy and decidedly low-tech. But Snapchat CEO Evan Spiegel does a bang-up job explaining Snapchat’s functionality and raison d’être. If you’re not a millennial, it is worth checking out how photos are used differently these days. Photos are used for talking, which is why evaporating images aren’t upsetting to Snapchat users and why the Stories feature is so important.

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