If you tried to use Facebook today, maybe you saw that something is wrong. Early today, people had problem to login and then login problem resolves and the other issue raised.
You couldn’t use any Facebook family apps.
We’re aware that some people are currently having trouble accessing the Facebook family of apps. We’re working to resolve the issue as soon as possible.
— Facebook (@facebook) March 13, 2019
It seems they are working on that and as they mentioned, it is not a DDos Attack, but, one thing is obvious that one of the main Digital Marketing player is out for almost half a day!!