Here is a great InfoGraphic published by Shea Bennett on All Twitter. There is a lot that can be learned about trending Social Media Sites and the demographics of social media usage.
The InfoGraphic is called What We Learned In Social Media 2014.
Tumblr and Pinterest were the fasting growing social media sites in 2014 and Facebook has the oldest user base. You can learn more about Social Media Trends on the SMI Blog, or by going directly to our Home Page and clicking the blog link.