On the internet, you have no other way to present yourself other than how you type. I prefer to punctuate as properly and spell as properly as I can (FF's built in spell check helps) since this is my first language and I feel it reflects badly upon myself if it looks as if I don't know how to use it.
It's good practice.
As long as we're talking about these nitpicks... People who don't know the period, comma, and shift keys exist.![]()