I think we can learn something from this experiment. The photos that were mostly taken as head-shots with the purpose of being used as a profile photo resulted in handsomer comparisons. That's a big deal, assuming you're looking to use social media to promote yourself. Photos of friends with odd items or making faces tend to result in strange connections, but that's what people seeing those images kind of do, as well. Anyhow, if you're trying to decide on which profile picture to use as your official online presence, I'd use Google Images to figure out which one will be compositionally attractive to your viewers. Unless you're just totally hot and could totally roll out of bed and take a perfect selfie to post on your profile.