Fads are interesting social cognitive phenomena. Something becomes popular, and loses popularly and wanes in its push. I suspect many trends on the internet are actually fads. They flame for sometime, and are then gone. They would not disappear completely, but would lose significance they were once supposed to carry.
When people subscribe to new things on the internet, they do so out of their curiosity and neophilia. Then the homeostasis of life takes over. Those that provide truth values stay, and those that don't go away.
I find myself increasingly drawn to those information of long standing values. I have and am subscribed to social network services, but these do not in general provide something of eternal significance. I am more and more yearning to read the classics, for example the original texts of the philosopher Henri Bergson, rather than reading the casual entries of people whom you barely know.
The time spent on the internet is a precious portion of life. If there is a double standard as to the quality to be expected between real life and internet time, then the discrepancy would eventually disappear, although no trends in life happens in completeness.