Social networks are now so well established, that there is a core ‘top five’ social networks that don’t change much from year-to-year. But, as we’ll see in this post, the most popular social media sites vary a lot by level of usage in different countries and demographics. Understanding these differences in popularity of different social networks is really important when targeting specific audiences. When comparing the most popular social networks it’s best to review them by active account usage, not just the number of user accounts. We’ll also see in this summary that some social networks are growing more rapidly than others while some are now in decline.