Thanks for that -- it is interesting. I think it's going to be a Sons of Sam Horny Dilemma soon.
It might be possible to have cross-platform discussions about a contract: "No, I wasn't offered $8 million a week. No, I did not demand my own private locker room with a pink shag rug and a red sofa. etc." Those are facts.
But what happens when Poster X says, "He's got the lousiest fast ball"/"fourth position" I've ever seen. And there's a response, "That's not true! I do not!!"
In the very early days of the Net, I'm told (Leigh could do this better) that there were a few artistic directors who posted. And I don't blame them. "No, I'm not an idiot, actually, and I do care about ballet, and the reason why we dropped Ballet X from the repertory is not because the mafia told me to or that I broke up with the choreographer, but because we lost the rights to the music" [I'm making that up]. But then what happens if the composer emails the webmistress, say, with a "That's a damned lie. I begged them to keep my ballet in repertory. And she did dump me!!! I can't post this, but what really happened is...."
Look what happened here regarding a Certain Ballet Competition. The first year, several people raised some very reasonable, factual -- as in verifiable -- concerns, not opinions, about how late the competition started, etc. The directors of the competition took exception and posted that they were being unfairly treated. Last year, we had no comments on that competition.
On the other hand, you can understand that an artist, reading, "I'm really in the know and my friend told me that Dancer X was fired because she sassed the director back at rehearsal on Friday," would want to respond if it isn't true. (Which is why we try to avoid "I heard this backstage" or "I happened to spot Dancer X at intermission and jeteed over to ask what was up."

Unfortunately, too, the more people try to manipulate message boards, the more rules the boards have to have, and this could prove destructive. If every dancer and artistic director (composer, critic, writer, costume designer, etc.) sends a friend or surrogate to monitor the boards and protect their interests, posting each time anyone dares say, "I thought Mme. Drekova was a tad off-form last night," no one will be able to say anything. Yet, as the article dirac refers to points out, we're all interested in what's really going on and if a board could say, "Sports Star of the Moment X will be here to chat with you every Monday night at 9," that would be a draw. And many people reading the boards would believe everything they read, because it's "inside information."
I see a vicious circle coming on......