This post is just a reminder for myself - I need to conduct a test on the thumbnail returns in groups and your friends listings because I have two theories:
1) Friend thumbnails on your own page are more often people whose profiles you've visited or who have visited yours
2) Thumbnails in groups are more often friends of yours who belong to the group.
Not sure how to conduct this one yet but I think I can construct and experiment with a newly created profile. More on this later!