Snapchat More Popular Than Twitter Among Millennials
While the data says nothing about actual usage of social media apps, it does indicate that Snapchat's reach among young adults is remarkably high, especially when compared to a multi-billion dollar company such as Twitter.
It takes a lot of work to convert short term success into a sustainable business in the social media space, and there are many examples for young tech companies that didn't deliver on the hype surrounding them, but at the moment it seems as if Snapchat's decision to turn down a $3 billion acquisition offer from Facebook last year, may not have been as foolish as many people thought back then.

Description
This chart shows the most popular social media apps among U.S. millennials in June 2014.