AARP and DoSomething.org just launched their second annual "Grandparents Gone Wired" campaign, where they try to get teenagers to teach seniors how to use things like smartphones and social media.

And this year they're getting help from one of the most-popular YouTubers, Justine Ezarik a.k.a., iJustine who has over two million subscribers.

Kids can sign up on DoSomething.org. And if they send in a photo of them teaching a senior about technology, they can enter to win a $10,000 scholarship. Just go to DoSomething.org, and there's a link on the main page.