How does Facebook generate your poke suggestions?

[emily ♥]

[Matthew Russell]

It puts together who's profiles you look at and who you send messages to to find your favorite people, and uses those as suggested people

[Ronnie]

Based on both of your Facebook interaction.

[mr. cool]

i just started wondering the same thing? is it possible that its people who look at your profile the most? my suggested people to poke are consistently people who i rarely, if ever, interact with, but who could imagine looking at my profile often.