I envision a reminder of the form, 'Dear Duncan Goodhew. This letter has some handy hints for how to keep your hair in tip-top condition. I suggest you have it framed and pin it up on your bedroom wall. Yours sincerely, Mrs Trellis.'

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.