I will tell you from experience, I had the Nexus One before, its just an Android thing. The facebook application made for it isn't the best. Honestly, I like the iPhone's FB app when I used that phone and I liked the BB FB app when I used that phone. For some reason, the app does not see notifications the same as the notifications when you log on to facebook. It usually notifies you if you receive a message in your inbox, but if someone comments on your status or activities similar in such nature, it does not seem to want to notify you of that sort on Androids...at least in my experience, this is what has happened on the Nexus One and MT4G (iPhone and BB FB apps responded well...)