I started noticing it over a year ago. The amount of grammatical errors and misspellings was definitely noticeable, but nothing to "shake a stick at".
But, simply patrolling the browse art section of Deviant Art, nearly every title was misspelled or included words that were used incorrectly. It is embarrassing to be a part of a community, that is the internet, when it is plagued with so many obvious and silly grammatical errors.
I can understand if a user from say, Finland, misspells words here and there, and doesn't quite understand where to put proper pronunciation. But when it comes to English speaking people that are either too lazy, or too dense to spell check what they type, or pay attention in elementary school. I find that irresponsible and embarrassing.