It's because in Iris, the "Social Network" section of the settings allow you to set how many degrees of separation you want to set for your global feed and notifications.
So if you set it to 2 degrees, anyone who isn't a friend or a friend of a friend won't show up in your global or notifications.
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Absolutely beautiful.
How depth 4 is less than 3? Run out of people? Maybe filtering on profiles to require a profile or something?
Good question, #[6] would have a better understanding of how the numbers are calculated
