Please note that some of these numbers are easier to find than others. A few of these stats come from Twitter’s own reports, but some are based on news reports and not official company tallies. Basically, this is the best I can find and I don’t guarantee anything to be 100% accurate.
Find Out How Many People Use Over 1,000 of Your Favorite Social Networks, Apps and Digital Services
Twitter User & Demographic Statistics (cont)
Percentage of UK teens (11-16 year olds) that use Twitter weekly:
Last updated 3/18/15
Percentage of online adults (globally, excluding China) that consider themselves regular Twitter visitors:
Last updated 11/24/14