the username fetish
Most facebook users know that they can choose a username for their page. This makes up a custom url, like mine: facebook.com/joshclement. Also, this becomes your facebook email: joshclement@facebook.com
Not surprisingly, most of the single letter usernames are owned by past and current facebook employees. Eg. Facebook.com/ A, D, G, H, J, K, L etc
Short usernames are known to be so valuable they become dangerous, but with url’s potentially disappearing for good, the ‘status’ of a desirable username of url might go away for good.