 Well, Sam is the expert, but I think he was a little conservative last year. As I see these trends continue, and we see the economy continue to show very positive signs, you know, and the consumer trend of people getting these unbelievable phones and data plans, my money is that it's going to be even more aggressive shift than we're even predicting right now, into mobile and specifically into mobile video. And I'm excited that Twitter is investing in India, that we're doing a lot in the video space with a lot of our content partners across news, sports, and entertainment. So we're very excited to do more with our partners here. We finished 2017 extremely strong and I couldn't be more proud and excited about what we've been able to accomplish this past year. We posted our first profit, growing the business internationally by 17% year on year. And even more exciting, I think, is that we've had double-digit user growth for five consecutive quarters. 2018 is poised to be a year of growth for Twitter, and we're really excited about what we're going to be able to do in India. I think it's a golden age for India. You know, if you look at the fact that corporations are posting very significant profits, you've got hundreds of millions of people moving above the poverty line, and you've got maybe the largest mobile technological revolution in the world. Whatever's happened in the West is going to happen in India much faster and at much greater scale. And I think that a lot of the estimates for what we see happening may be conservative as it relates to digital spend. I look at the market, you know, it's still very, very much leaning towards some sort of traditional formats of TV and print. And with the way consumers are moving to mobile and to video, I think 2018 may be an inflection point for big shifts into the digital space. And for Twitter, we're really excited about the position we have here in the market and investing here in 2018.