if you cant find it in the market nor anywhere else (i have it, but at home and im currently at work, or id post it) restore to youre previous rom that has it, back it up in TiB, reflash the rom that doesnt have it and then restore it via TiB again

 

I've had some apps not show up, usually it was random, and re-flashing or backing up from Astro fixed it.

 

astro? dont-cha mean TiB?

 

I would boot to recovery and wipe cache and Dalvik cache, then reboot phone. The Facebook app should reappear in manage applications.

 

Nope, astro can back up most, if not all (only had issues when backing up angrybirds and rio in the same go) apk files. It doesn't save data, but it's very useful if you get an app, and then the devs add some ads to it or something and you don't want them. (but that's what adblock is for)

I use it because some apps are huge, I usually have spotty signal at home (where I do my rom flashing)

But TiB does get the data, but sometimes fresh starts are nice.