Fair points to all on how it probably evolved - as a result of people who write they way they talk, because they do sound the same. Toward that end, it was probably not accurate for me to state that usage of these semantics is an indication of anything remotely resembling stupidity, laziness, lack of education or anything derogatory. The assessment that it likely is the result of not writing/reading very much I think is spot on.
To the other point that "if you get the meaning, then what's the harm?" - I do get the meaning, and you're right, no one was harmed per se.
BUT
The written word is different than the spoken word, and following the direction of writing like you talk is not good advice imho. If we do that, then the written word loses all structure and relevance.
I kud riet wike dis n git undurstud
I would respectfully submit that language is not meant to be written phonetically. If society moves in that direction as a whole, then writing as a craft will continue to lose appeal because no one will really see any need to learn any structure or parameters for commmunicating with these funnny things we are calling letters and words, verbs, sentences, pronouns and such.
It's ironic I am saying this, because I've been told that my writing is much to formalized, and I need to loosen up my style when I write. I think mine comes from my age and education, but even then, if you ask me about verb tenses and throw some other grammar terms in there, I would currently be woefully unprepared to explain several of them.
For instance, if you as me to explain th difference between the verb tenses of past, present, future, future imperfect, past subjunctive, and past perfect, I would likely fail. What's a participle? Is it dangling? Dunn0 - by maybe I used to and just plum forgot! LOL
All that and a literal cornucopia of other things can get very confusing, and I am certainly not one to waggle my curmudgeonly finger at others for not knowing all that, because I sure as hell don't know many of these examples well enough to be the arbiter of any kind of judgement. What's the old saying - judge not lest ye be judged? Yeah, that's my motto!
BUT, I learned about contractions in the 2nd or 3rd grade (I think), and my general hope/expectation is that a high school - well, maybe a college graduate...whichever, should have at least that level of understandin. Sadly though, many don't anymore. Can I change it? Nope, but I can grate my teeth or roll my eyes at it...and yes, I admit, occasionally I do judge based on someone's written words, but only when I have nothing else to go off of. I try not to, but I'm human, and let's face it - we tend to be judge-y kinda people.
The only other thing I will throw out there as something to chew on is that perhaps much of this may be coming from voice detection programs like Siri and Dragon Naturally Speaking and such, which just look for word detection, not grammar detection so the "would've" that someone dictates into their phone for FB, email, and the like may often come out as "would of". That, combined with the fact that most people tend not to proof their written work anymore, especially when it's things like social media, and email. The value is just not seen to present your written word better (beyond those who read and write regularly of course...)
I think that's ultimately what saddens me. I try not to cast dispersions on anyone that uses the "of" at all, but seeing it does make me grate my teeth from time to time!
Thanks for all the discussion and dialog here though - really gave me food for thought (as you can likely tell! LOL)