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Indeed it does.
I used to belong to a private web forum where the owner required those who wanted to join to write a short explanation of why they wished to join. It was a real eye opener for him to receive paragraphs without a single coherent sentence. A large majority of the world populace are challenged to pen a well written description of anything without the aid of smilies and emoticons!
A real eye-opener for me years ago was realizing that people who don’t speak proper English rarely read/write it (in my ignorance, I assumed regional/ethnic accents/dialects were just that - and soon realized people that speak poorly aren’t just lazy - they are simply uneducated).