I know most of you prob think this guy is an anal freak. This guy is actually teaching a lot of you an important lesson. I used to always write stuff like isnt, didnt, youre(hell I would write your in the wrong place), and wont and stuff like that without the '. Hell I didn't even know why they were needed.
In business and with Girls it is very important to write correctly. Girls and pretty much anyone higher up in Business notices small stuff like this. So if you want to go the Corporate route I highly recommend you follow this advice. And while you can still get laid with ease without using proper grammar I know a shit load of girls who complain when a guy writes stupidly. Those same girls appreciate a guy who uses grammar properly and they will be fonder of him for that.
Most of your competition does not use proper grammar. Most people write like shit.