I think facebook is becoming obsolete day by day because of the following reasons –

1.the coming of more interactive applications which enable people to interact in real time.

2.the major data breaches and other allegations on Facebook which have put questions on its data handling capabilities.

3.the wave of de-socialisation seen in todays era.
People, rather than being open to other’s ideas and lifes, are choosing to assert their own views.

In other words from an era of discussion and consultations we are moving towards one way assertion of our own “right” over other’s “wrongs”.
Thus in such an environment Facebook is bound to loose relevance.

It is rather interesting to note that the people’s disinterest in facebook is being accompanied by increasing popularity of Twitter. The trend is easily predictable as on twitter one can write his/her opinion and be seen by thousand others without any formal friend request or risks of privacy.

Thus, the decreasing popularity or interest in facebook can be attributed to both Facebook’s own doing and also the change in our societal structure .

The answer of who is god has seen a tremendous change as our societies have evolved over time.

In the ancient civilizations which existed thousands of year ago. People used to worship the [then] inexplicable phenomenon of nature in the form of various GODs.viz. god of Thunder, Rain, Storms, etc.
Also there evolved another form of Gods which were physical embodiment of natural calamities which were beyond human control.viz. God of floods, earthquake, etc and another form of Saviour GODs who would save them from these calamities.

With the advance in science and technology and our evolving of the understanding of the phenomenon of nature, the answer of who is god has seen a fundamental shift.
Now that we understood the phenomenon of nature the fundamental question that puzzled us was the creation of universe. Hence god started being worshipped as creator and destroyer.

In the contemporary world since we have, to a major extent evolved a scientific temperament and a causal relationship in various aspects of our material life, we have worshipped god to mainly fulfill our spiritual needs.

In the current scenario god is seen mainly as an escape from our material life and to know the still puzzling question what is universe and the meaning of life.

Thus, we can see that the human beings inherently attribute the inexplicable aspects of their life to Gods and look for them for their spiritual needs.
I believe once we fully decipher the current puzzling questions, the answer of “who is god?” will again see a paradigm shift.