I then visually split the profile pics based on where I met the person, what was contained in their profile picture, and their gender.

Outer section contains non-photographs/non-human subjects. The darker ring contains pictures with more than one person, and the lighter ring contains photos which feature only one person. The innermost point is me, of course. Each jagged slice indicates how I got to know the person, and the reddish half indicates female while the bluish half indicates male.

A shoutout for the two profile pictures that are still using the rainbow FB filter from the SCOTUS ruling back in June. I only changed my profile picture to something non-rainbow recently myself. Coincidentally (or perhaps because of the following fact), both happen to be members of minority groups and are frequently involved in civil activism.

Also a special mention for my friend in the upper right corner, who still sports a profile picture honoring Satoru Iwata, the late former president of Nintendo. 

Gender spread was pretty even (24 male, 26 female). As expected, more university people rose to the top of the friends list since they're the people I interact with most these days, followed up by my boarding school friends, then the friends I made prior to that. All the profile pictures are also spread mostly the same across the rings with the exception of my male hometown friends, which make up a significant portion of the non-photograph section.