Are the 8 friends appearing on your profile chosen randomly? (fb)?

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I'm talking about the 8 friends who appear on the profile page on facebook timeline. Are they chosen randomly? I have 300 friends, but only seem to see 10-15 friends ALWAYS on that list and no other friends. (those same 10-15 friends appear on the smaller list of 6 friends at the top)

Facebook says they're chosen randomly, but from YOUR experience is it really random? Or are they the people who you think could be visiting your profile a lot?

For me it seems like it's the people I interact with a lot, but also some people I never interact with, but I think could be visiting my profile a lot. (2 had admitted to have a crush on me in the past for example) What is YOUR opinion on this fb "mystery"?