Dismal Facebook content delivery

Since recent, Facebook video streams have been dismally stodgy. They buffer every few seconds. I have 100Mbps fibre Internet. I stream Netflix full HD without any snif of buffering. I stream DSTV without hiccup. I stream F1 TV without a glitch. But only Facebook buffers every few seconds. App reinstall makes no difference. Platform reboot neither. Dismal content delivery.