Multiply duplicate notifications from Facebook

[macmesser]

I recently updated from El Capitan to Sierra on my '09 Mac Pro classic. I now get notifications from Facebook many multiple times. Seems to be only notifications from Facebook that get duplicated, and many times. Just got one now 22Xs.

 

[dogslobber]

Stopping use of Facebook quickly solves that problem.

 

[macmesser]

Stopping use of Facebook quickly solves that problem.

Would love to, but I need it for business.