System Design · Meta · Hard
Build the access-control and visibility layer for posts in a social media application. Each post can be assigned one of the following visibility modes: public: visible to everyone. friends: visible only to the author's direct connections. friends-of-friends: visible to direct connections and their direct connections; supporting this mode is optional. only me: visible only to the author. custom: visibility is determined by an allowlist, a denylist, and/or named groups. These…
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