Just want to get this straight - please confirm...
- you have or had the facebook client installed? (which)
- if ever uninstalled, when and when did you try to reinstall?
- are there any other facebook tools that might suit your needs, in the maemo.org repository (not Ovi)? If so, which?

I'm not a facebook user so perhaps someone else will have a better idea
... all the same, it's worth trying to clarify the time-line and which pieces of software are installed on your device (relating to your problem).