Over the weekend Facebook updated their app to leverage new functionality - namely when a Chromecast is in range it will give you an option to cast it to the device.
- Operating System:
Unfortunately for some, it appears to be triggering when any video is opened and only can be removed by Force Stopping the Facebook App
The beta version of the Facebook app, available through the Play Store's standard beta interface, doesn't have this bug. The beta version is also up on APK Mirror(version 18.104.22.168). There's even better news: the Chromecast notification seems to be a precursor to full Chromecast functionality in Facebook, which was promised earlier this month.
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Chromecast Notification When Opening Facebook
Remove what seems to be an improperly triggered Cast option using Android