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By October 2016, WhatsApp had solidified its role as a primary engine for "dark social"—the private sharing of content that bypasses public feeds. The nomenclature VID-YYYYMMDD-WAXXXX indicates a file that was likely downloaded from a chat group or forwarded multiple times. VID-20161027-WA0045 - XVIDEOS.COM
The date in the filename provides a specific window into when the media was created, which can sometimes be used to identify the context or the individuals involved, further compromising privacy. Technical Persistence in Search SEO such as the By October 2016