two things
A) why does it exist
B) why does my browser overload each time i go to the "users" page to unfollow some afk guy so i can follow another lovely user on here, no matter the browser i'm using
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As to why it exists, I imagine that it's because the Activity Page somewhat breaks down and becomes un-useful when you are following that many people, and I imagine it's also because Bungie would prefer that you follow the people you actually care about rather than simply clicking "Follow" on every person who ever said one good thing.