The course of social media never did run smooth — not for long, anyhow. And for some Web 2.0 companies, it’s running less smoothly than ever.
It goes without saying that Facebook is the network du jour, but even though the reigning champion’s user stats keep soaring, social networking as a whole might be leveling off. Nevertheless, there are still scores of other highly competitive social sites that are waxing and waning; and different networks and apps are more popular in specific geographic areas, with certain genders or age groups and even among various social classes.