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The fact is that the notion of strictly "correct" grammar and spelling independent of actual spoken usage is relatively recent ...
This is a great thing to keep in mind.
Most of us aren't aware languages are fluid things, which evolve, mutate (and decay) constantly. So the rules that try to encapsulate them can never keep up.
At any given time there are hotbed areas of change: new terms, simplified spellings, colorful sayings-of-the-moment that slowly turn into clichés and then standard idioms. Etc., etc.
People who don't give their English much thought and who ad-lib or abbreviate spelling/grammar are kind of like the radiation that makes our human genome mutate over time. They cause a lot of "noise" information -- most of which gets rejected, and disappears.
But they also innovate and simplify. If their innovations happen to catch on, the language ends up changing.
And hey: it's gonna change, whether we approve or not!
Most of the time I kind of enjoy crafting English so that it more or less conforms to recent ideas of "standard" and "correct".
But I also like the chaos and "creative" usage/spelling that's constantly gushing forth on the web. Texting abbreviation, for instance, is often really smart!
on TB. LOL
I have an extra case of those if anyone needs one....