Fighting the good fight for good language with the most effective weapon there is: ridicule. Photographs on our wall of shame document trespasses against clarity, inadvertent blunders, and of course the ineffable grocer's apostrophe. Come for the pics, stay for the comments.
Group rules : Your own legible photos of errors of spelling, grammar, punctuation and wrong-wordedness, preferably suitable for mocking. If your 'puss is not in English, translate and explain so that everyone can join in the sneering.