In addition to the excellent sources already mentioned, you might find the Econsultancy Social Media Statistics report useful (link below). It's part of our Internet Statistics Compendium, which is updated monthly with all the latest data - hope it helps: Social Media Statistics. read more
Here you can find analytics by country and can manage multiple social media at once in a one tool. 1.3k Views · View Upvoters Helen Kula, Data wrangler, researcher and librarian who works with start-ups and entrepreneurs. read more
Other countries with the largest social media usage increase includes India, Indonesia and Ghana as technology is improving and social media becomes easily accessible to more of the population. U.A.E, South Korea and the UK have the slowest increase with <5%. read more