Laurent Eschenauer: @BarnabyWalters On this note, there is a quote too much on the 'in reply to' link: http://t.co/SbTJY1bYPn -> breaks your pingback ?

Laurent Eschenauer thanks for the heads-up, on closer inspection it looks like the problem is on your end — the URL in the with attribute of the action element has that quote at the end

updated: