RANKED: The 20 most influential Vine and YouTube stars under 21

Teens these days love the people they see on YouTube and Vine more than traditional entertainment celebrities.

These digital-first stars have millions of followers on the various social platforms, and can make thousands of dollars on a single post that's sponsored by brands.

And they're not even allowed to drink yet.

The web data startup ZEFR tracks and ranks the actual engagement among the top digital stars to find out who actually has the most social pull.

Meet today's biggest young influencers: