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You wont believe what Facebook has patented!
Facebook wants to broadcast high pitched sounds in TV commercials so FB app can detect them and serve you relevant content and/or track conversion from offline to online channels. Nothing to see here – just another crazy conspiracy theory!
source link: https://www.reddit.com/r/greatawakening/comments/8u4ft3/facebook_wants_to_broadcast_high_pitched_sounds/
https://www.youtube.com/watch?v=wG4aqUsj77c&feature=youtu.be