http://i.telegraph.co.uk/multimedia/archive/02459/facebook-eye_2459156b.jpg Even if you found something really brilliant, once you get used to it (know every aspect of it and all the systems it works in), the thing doesn't look cool as it did before. It seems that the same thing happens to Facebook, which means Facebook won't be popular and prevalent 20 years from now. There are three cues which..