Re:America’s Teens Are Choosing YouTube Over Facebook
by dpark on Friday June 01, 2018 @08:34AM
(#17204675)
Of course the backing service is not PHP. That would be a particularly poor choice for a high volume messaging statement. They originally wrote it in Erlang and later rewrote it in C++.
https://www.quora.com/When-did-Facebook-switch-away-from-usi...
But I doubt it and I'm sure you're wrong about what runs Messenger. No company, least of all the Facebook scale ones use just one language for everything.