Assuming this isn't because the person you're contacting has lax privacy set up in their FB account, have you ever played "6 degrees of Kevin Bacon"? You (I assume) probably live near this person, are probably approximately the same age, single, you may even have some obscure friends in common. Or friends of friends. And what you don't remember are the countless recommendations that are totally off base. For every "uncanny" friend recommendation I get, there are dozens of people I don't know.