I do this just in case Magic goes full retard and thinks someone's last name is "personal information".
I'm serious.
What someone determines as personal information is solely up to the person.
For example, if anyone here posted my last time, I surly would ban them faster than they could blink.
Since It's up to me to decide if I want that information released into this community, not someone else.
I don't know any of their last names. Even if a few of you in here do, there isn't any reason not to black out the names. Hell all I need is their date of birth, and their full name, and I could easily go and open a credit card in their name. (though it would be a bit more difficult in this case since they are all underage)