Are you sure that the users of facebook, pretty much all ages and people from all walks of life, including some that do not otherwise use computers, especiallly with the smartphone explosion, need constant change and upgrading? These are not the cyber geeks of the social net sites of yesteryear, looking for the next cool thing. These are people that have taken this software and integrated it into the most important aspect of thier lives, how they communicate with family and friends. Facebook is an efficient, free, familiar tool for this, nothing like it has existed before and I think the death of this beast is a very long way off, if indeed it happens at all.

I think it is the modern day equivalent of the telephone directory.