The Nerve Twitter account, @PlayNerve, most recently posted the following:

In the movie, Nerve, Vee, played by Emma Roberts, and Ian, played by Dave Franco, play Nerve for fame and money. However, as they continue to play the game, watchers steal their identities and force them to go on dares in order to keep their money.
We wanted to play something that was just as fun, without the danger. In our search, we found an app called Double Dog. You can play for real money and fame, but there’s a system in place to make sure that it remains safe to play. Find out for yourself by downloading it here.