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Substack could decide, for example, to provide an app that showcases all of its writers, enabling a user to search through the newsletters, browse articles, and sign up for those they wish to. This would be analogous to the Shop app by Shopify.

Web Infrastructure — A different type of critical infrastructure, web infrastructure, is also increasingly important. For example, how can we ensure the right people are on the Zoom call and security hasn’t been compromised? In the past weeks, we’ve seen the rise of “ZoomBombs” or disruptive screensharing in Zoom video chats, and the U.S.... See more

Messaging apps are about conversations—typically with friends or friends of friends. You don’t need friends for social media.