For those posting after my post, again, it's a common security question for a lot of your financial logins and websites.
I assume a lot of these questions arise from those questions being posted on FB as they are a lot of the same questions. Some, well, many that Slo and Spinneret posts are fun, taking up the hole in our hearts from missing Low-Key's threads, also many of them that are on FB are specific financial security questions. Middle name, father's name, where were you born, where did you first live.... All security questions for website log-in security.
Not to say they are being asked in this way here by these fine folk. But I definitely question them when I see my friends freely giving up the information on the book of faces. I answer every one of them on FB as well with the same answer, "Security Question."