. >> chersheryl, what about you? >> there's so many great ideas, but we only can do a few really well. and so at facebook what we focus on is how people share and making that sharing experience better. and, you know, that's taken us from all text to a news feed to photos to messenger to video. but pra whwhat really matters i happens with people's lives. when you can start a business online without needing a store front. when you can express your views about your government. when you can remember a family member's birthday there a way that's different, that brings people really together. look at what happened over the last week with bill and melinda's annual letter, right? you've published it for a long time but they published it, it's on facebook, i know i posted it, i know a lot of other people posted it and as we post we add our voices. >> melinda, let's talk about your letter. you're looking at the advances we've made over the 15 years since you started the foundation. >> so bill and i write about the fact we're m