YouTube
ZayZay and Jojo, 5 and 7, are huge on YouTube with millions of subscribers and views on their videos.
From little kids like toy reviewer EvanTubeHD to brothers ZayZay and Jojo, kids are getting their start on the platform at pretty early ages - and they're becoming super successful.
We rounded up a list of our favorite nine stars (some are duos or groups), all people who have used YouTube to skyrocket to fame.
Most of these celebs are young, but we also noted a few who took advantage of YouTube's boom several years ago and never looked back.