www.smartinsights.com/social-media.../social-media.../new-global-social- media-research/4 days ago ... But, as we'll see in this post, the most popular social media sites vary a lot by level of usage in .... When looking at the world by number of internet users, it really rams home the importance of East ... Among the 50-64 age cohort, use hasn't increased since 2013. ... 2015 Social network popularity by country.