One problem that I have seen on this (and other services) is the tendency to use code phrases and acronyms like "YAGE", the web (and other programming) tags like "[moderatormode] blah, blah, blah [/moderatormode]", and other "shorthand" like "LMAO". While this may get the message across to those in the know, it leaves those less "web board enabled" out of the loop.
I've been involved in moderating since the early days of personal computers (starting when I was once the infamous (to the Apple Newton community, at least) "PDC Sensha" on America Online, a long, long, long time ago), so I'm not exactly new to the concepts involved, but I have to confess that I had no earthly idea as to what "YAGE" meant. I can only imagine what a (nominally, see below) eight or twelve year old girl, searching for help on a woodwind bulletin board, thinks when she sees such stuff.
The rules of composition that I was force-fit to allowed for abbreviations, acronyms and the like, just so long as you define them at the first instance that they are used. Now, obviously, there are limits to this sort of thing - imagine having to define "PM" as "Post Meridian", a definition that would also need to be defined for most, each time it first came up in an internet posting. But, I think it is better to say "We don't tolerate nasty postings around these parts when you are leaving" than it is to respond (undefined) "YAGE".
(Of course, I know that most are not as well-endowed in the typing department as are the likes of moi (French for "me"). Many of these shorthand phrases may have had their genesis in the ham-hands of two fingered touch typists. Still, if the purpose of the Internets is to communicate, there as few obstacles as possible ought to be placed between the speaker ("typer") and the listener ("reader").
Of course, this is not my website, and bear in mind that these are only my opinions. But, they are opinions that are also held by those far more qualified in communications than me...
NOTES ON THE GIRL:
From the style and content of the postings from the young lady who is part of this discussion, I get the impression that she is either exceptionally intelligent for her age, or that she is not really what she seems.
This is nothing new. The news media carry stories of adults posing as children on the Internet, and I would imagine that any given person could come up with some reason to do this. Why, I don't know. But, I suspect it nonetheless.
Similarly, I am of the opinion that virtually all of the folks with low post counts who put up something like "I have an old saxophone that used to belong to my uncle - (here, insert description of generic Conn horn) - how much is it worth?" are nothing more than folks trying to make a buck on eBay with a horn that they picked up in a pawn shop.
But, we're not about to start certifying everyone that we meet on the Internets...