LongHairedWeirdo isn't currently in use on either LJ or DW. If I recall correctly, the maximum length for LJ usernames is 15 characters, in which case this wouldn't fit; Dreamwidth allows longer names (though I'm not sure offhand how long. (I just spent a couple of minutes poking through the FAQs, and couldn't find the length limit for LJ, just that if a name is too long, you'd get an error message.)