Focus obsessively on customer experience. If you’ve read anything about Amazon, you know this one. I won’t belabor the point. But keep it in mind: it’s not about the tech, it’s about what the tech can do for customers.
Disinformation and Fake news: a single app would not control how to display and filter your feed, meaning that any enterprising developer could build their filters to spot unauthentic content and prevent the spread of misinformation.