Mp4 - Vid 20170309 Wa0010

The date the video was created or saved to the sender's device (Year/Month/Day).

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Short for WhatsApp, indicating the platform used to send or receive the file. The date the video was created or saved

A sequential serial number used to distinguish multiple videos sent or saved on that same day. Why You Might Be Seeing This VID 20170309 WA0010 mp4

Trends like the "Mannequin Challenge" were still being shared in various forms.