Why are certain people on Facebook under "Friends" on the left side of my wall?

[Tyler]

Every time I log in, there are the same ten people on the left side of my wall. My sister told me those were the people that view my profile the most but I doubt it
And it's not in alphabetical order.

[Kalin]

She's right.

[abraXus]

it's based on mutual interaction

http://abrax.us/Facebook/WhoViewsProfile.php

[Rom Cartridge]

According to Facebook:

“By default, a changing selection of all your Facebook friends always appears under the Friends heading in the left column of your profile. This selection might include friends who you interact with the most in Wall posts, comments and mutually attended events. However, Facebook does not select friends to show based on whose profiles you choose to view or who you interact with over messages and chat.”

[Nicole <3]

I've heard it's who views your profile most. They say its not true, but my mom and my sister are always up there, and I never look at their pages but I know my mom looks at mine a lot