Incognito mode simply means there will be no record of your browsing or download histories. It will not make you 'invisible' to your Facebook friends.
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No not really. Messenger is an independent app, you can work with it even when you dont have facebook app.
Facebook App from the Apple app store.
The Facebook application can be downloaded for free in BlackBerry App World. :)
U could get an app for facebook
buy the app for it