I see it all the time and makes me wonder. See it in responses all the time and even
printed media!

When did the word "OF" replace "HAVE"?...as in..

I would of instead of I would have, or would've..

Could of instead of could have or could've.

Should of instead of should have or should've...

Improper use of their, they're, and there...

Then this text speak crap...

U...is a letter, not a word or pronoun..

R...is a letter, not a word, adverb, or verb.

This list could be endless...