In order for facebook to work on 5.0 OS, they need to update the facebook app. Remember that 5.0 it’s a new OS so some apps that works on 4.7 probably won’t work properly or won’t work at all. That’s the problem we have on .191 and we will keep on having this problem I think until 5.0 is official released and developers can work on new version of apps.
That's too bad because my experience with Verizon Wireless is that they drag their feet on everything that might benefit the customer. I have only been with RIM for about 2yrs but I think if the update is on their part we could see 5.0 official before years end.