Jordan Moreau David Dobrik has roughly 75 million followers across multiple platforms and more than eight billion views on YouTube. But the social media star’s grand ambition is to be the next Jimmy Fallon — and as a stepping stone to get to late-night TV, he built his own podcast studio in his new house.The 24-year-old rose to fame by mastering the six-second art of now-defunct social-video app Vine in the mid-2010s, where he created short comedy skits with his friends in Los Angeles.