https://techcrunch.com/2015/10/22/facebook-says-it-fixed-a-b...
Supposedly it was a bug, but with Facebook, who knows.
How much issue tracking and scrum management and engineering work and code review and testing and deployment and maintenance went into accidentally streaming silent audio that you only stop doing after you got caught and have to claim all that successfully tested and deployed work was unintentional, without ever explaining the actual innocuous purpose of streaming silent audio and paying for all that extra bandwidth?
I hate FB, but not everything is always a sinister plan, although this could have been. I will repeat: "with Facebook, who knows."