How do people get added to the "Favorites" list?

How do people get automatically added to the "Favorites" list? If you don't add anyone manually and basically leave it alone, will the list always consist of people you've frequently called? Why I'm asking: Is it at all possible to have a contact show up on there whom you've haven't talked to in months?

And another question, does the favorites list just consist of people you've talked with on the phone the most or is it summed up with the amount of texts and/or e-mails with the people too?

Thank you for any help!

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