In the relentlessly on-demand world of livestream gaming, few are as in demand as the YouTube creator Valkyrae. Last month, over 650,000 fans viewed her playing the space-cartoon multiplayer game

David Dobrik, 24, is one of the best-known YouTubers in Hollywood. He made a name for himself on Vine, the short-form video app that created a generation of online stars.

When Casey Boykins, a 24-year-old Brooklyn actress, first started dating Allie, a 26-year-old actress, in March, the chemistry between them was undeniable. The two women had met two weeks before