Will social networks increase in size is not an obvious hypothesis. There could be more networks and more groups but cognitive power of the brain is limited to the number of friends one can develop. "Extrapolating from the brain sizes and social networks of apes, Dr Dunbar suggested that the size of the human brain allows stable networks of about 148," quoting the related article by The Economist. Even more worrisome is the fact that with the rise of social networks, the number of "core" friends is on downward trend.