I have been on Facebook for about 4 (maybe longer) years and the activity seemed to peak between 2009 - 2010.
However, over the last 6 months, I have noticed that there is a definite decline in activity on everyone's pages. People comment much less if at all, likes have declined, people that were getting loads of feedback are now getting much less. (this is based on 2500 friends pages, most randoms as I used to DJ / radio part time which resulted in lots of random requests)
Perhaps the novelty has worn off and people are simply using it to stay in touch instead of entertain. To me it seems that earlier users are using it much less while older users and users from other countries are boosting its userbase and activity.
Thoughts?
For the general population, I definitely don't see Facebook going away. Things such as invitations to social gatherings are done completely over Facebook increasingly by people I know...
Oh, and one more thing...
tech people > hipsters