I don't use Facebook in Candy Crush Soda Saga's case. It was a general connection failure. Episode races wouldn't sync, claiming a connection error. Among other things.
Uninstalling and reinstalling fixed my case of connectivity issues, maybe it will also fix that problem. One thing that may help is having the app on more than one device in case of a problem on one. (Sometimes the device plays a part.) Be careful, though! Have a great day! I hope it works if you try it!