Chelsea posted this picture to their official Facebook page with the caption "Superb away support as always". You don't have to be too big a football fan to tell that the picture is of Cardiff City fans...
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It being social media, fans weren't too slow in pointing out the error.
Remarkably as of 11am today, the picture is still there. Maybe the Chelsea social media team are huge fans of Vincent Tan and won't accept Cardiff's colours as blue.
