Periscope, Twitter's live streaming app, is getting quite a lot of use from brands, but Doritos new Roulette game is the most creative so far.
As part of their #DoritosRoulette campaign (some chips are hotter than others), they are running a live game on Periscope at various times, as well as on Twitter, with winners being announced on Vine. The game on Periscope involves a spinning roulette wheel - I haven't managed to find any archived videos yet.
"For the live game show on Periscope, all users must do is tune in on the app to automatically become eligible to be a contestant on the game. There will be a Roulette wheel, which the game show host will spin, leaving contestants to win prizes based on where the wheel lands."