Facebook App Not Working after Update
Edit: this seems to be a problem that Facebook know. It's an issue with the Facebook application, and not a generalised Play Shop problem.
This is what worked for me a minimum of.
- Settings > Apps > All > Google Play Store, Clear information and Clear cache
- Settings > Apps > All > Google Play Solutions > Manage room, Clear all information and also Clear cache
It doesn't injured if you reboot your phone before you attempt upgrading facebook again. And, the mount was SLOW. Simply at the very least 4-5 minutes. However, it did job. If not try to uninstall it, or just wait on a repair.