Grammar and abbreviations etc are important for formal writing and examinations but please remember there are some people who have not been well educated, not priviliged and some people may infact be dyslexic, have a brain injury or some other illness that prevents them understanding how to convey themselves online. (Sorry for the long sentence!)
In my opinion, all communication is good!
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Pegasus
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“Everybody is a genius. But if you judge a fish by it's ability to climb a tree, it will live it's whole life believing that it is stupid.” - Albert Einstein