FB is already popular. If more features are added it becomes more popular. People see the the utilitarian aspects that are favorable to them.
Before Facebook came into the picture there used a social site called Mypage started by apple which was 'The platform' for all those who wanted to socialise. I am sure they never expected a competition like that of Facebok, so one never can say ! Tomorrow something even more sophisticated and attractive site might happen...
Pay no mind to those who talk behind your back, it simply means that you are two steps ahead !!!
I was a member in My page 5. Now it's defunct. Yes, a permanent place for these social sites is not guaranteed. Arrival of new social websites cannot be overruled.
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