You see them everywhere, but there’s still no excuse. If, like so many others, you’re in need a refresher (or you just want some hard and fast rules for remembering where you should and shouldn’t dump apostrophes in your sentences), check out this guide on theoatmeal.com. As well as being pretty funny, the rules of apostrophe usage are made pretty clear.
The most important rule is the one in big letters at the bottom – when it doubt, don’t use an apostrophe.
Couldn’t agree more!