It does raise the issue of allowing people to post on the first go -- although arguably if you're posting a link you should be made to preview, so maybe this is a good thing. I've been tempted to make the field an ordinary one with the prompt "Shoe size:" or something in front of it. Regular players will know that most of the time they don't have to put anything there and anyone else can type anything they want and it won't hurt anything.

[Dan] A preview does appear, and since links are often mis-entered, this is probably not a bad idea.

[rab] Sorry, I came across as critical of the idea in that last post. I think it is a splendid way of limiting the unwanted spam without preventing links at all. Sorry for any confusion.

[SM] No criticism was inferred.

I think an actual game of MC should go in it.