Final answer:
Brent Rivera started his Vine channel in 2013 and gained popularity for his comedy skits.
Step-by-step explanation:
Brent Rivera started his Vine channel in 2013. Vine was a short-form video sharing platform that allowed users to create and share 6-second looping videos. Brent Rivera gained popularity on Vine with his comedy skits and entertaining content which eventually led to him having millions of followers.