These two pi charts are connected to each other. People are, by nature, social creatures, so it isn't a surprise that they find people important to them. I analyzed how many people each person had in their profile pictures and what relationship those people had to them.

Although more than half of the images were selfies, a quarter of the images featured another person, and the rest even more. Even though profile pictures are probably designed to just show who oneself is (physically), many people choose to show friends and family in their lives. It could be that by showing the people who have shaped them into who they are, they are showing themselves.