Facebook for HTC Sense not working Somehow, Facebook for HTC Sense has disappear from my HTC Vivid. 

In /system/app I've found HtcFacebook which is  com.htc.socialnetwork.facebook. When I try to install it errors with Application not installed. 

I've tried to find this package on the Internet to install it, but could't find it anywhere.

How can I get the HTC Facebook back onto the device?
After many failed tries to reactivate the HTC Facebook, I've decided to reset to factory defaults. This fixed the issue. Now Facebook for HTC is working fine.