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Although there are third-party applications that claim to help you see who has visited your Facebook profile, Facebook asserts that it does not support this. To see the locations of the people who are viewing your Page, click People on the Insights page.
People you never have contact with will most likely be at the very bottom, and those that you communicate with more frequently will probably be up top.
For me, the first three profiles that showed up were with people that I messaged or chatted with yesterday.
From my research it appears to take into account recent interactions (in messages, chat, or comment threads) and frequency of recent chats.
It's rumored across the web that the person located at the very top of your "Initial Chat Friends List" is the person who last looked at your profile, but this is wrong.