I don't know if this was true with 1.21 as i didn't add the facebook profile until 1.3.1.
I notice that when i add the facebook contacts profile, it becomes the primary profile regardless of my settings and preferences. This sucks because the phone app, quick contacts, etc.. use the facebook picture instead of the picture i have assigned on my exchange profile.
I have changed the primary profile on these linked accounts to use exchange as the primary profile for the contact, yet everything still pulls the facebook pic.
Even tried removing the facebook profile all together, and then reloading it.