I was glad to see the post that the apostophe can be correct when used to avoid confusion. I personally use PM'S , (don't want people to think I'm saying "I got your PM syndrome

)
I personally don't mind seening grammatical mistakes in emails and foruming, I'm guilty of not always proofing before I post, and as was pointed out, people have different skill levels in english.
But when it creeps into billboards, magazines, and newspapers, it makes my blood boil! These people are professional wordsmiths, for crying out loud; they are paid for their mastery of the language. There is no excuse, none, for bad grammar in the media.
DEATH TO THE MISPLACED APOSTROPHE!!! IMPEACH THE POORLY USED
SEMI-COLON!!! JOIN ME, MY BROTHERS TO SAVE OUR BELOVED TONGUE!!!
(I hope these word's made sense: I didnt mean to people with grammar shortcoming's)