I installed the new 4.5.0.138 OS on my Curve. And after doing so, my facebook icon disappeared from my apps menu. It's installed on my phone however. I checked my list of applications in my settings and it's there. OH, and along with facebook, my myspace icon is gone as well. Any help would be appreciated.
Oh yeah, I'm sorry. I meant to mention that. No they're not hidden. Neither one of them.
Hm. Maybe try a battery pull? If that doesn't work you may have to reinstall them. I haven't had a problem like this yet but when I installed the new Facebook the Myspace App somehow got deleted and I ended up having to uninstall and reinstall both applications.