Certainly the original post has useful information for those who want their writing to be taken more seriously. However, the issue here is orthography, not grammar. (My apologies if someone has already pointed this out, as I admit I've only read the first post and the last two!)
ETA: except for anyways. All the other contrasts, I think, exist only in the written language, and therefore are really just spelling or punctuation errors.
Orthography is a subset of grammar and you are certainly correct, but in context of the topic and the majority of social media in general (especially at the time this thread was initially created), the implied subject is the written word, so I'm not sure the distinction of orthography is entirely necessary.
But I won't lie...the fact that you pointed it out turns me on.
"What can you expect from a bunch of seitan worshippers?" - Reginald Tresilian
Affect can also be a noun just as effect can also be a verb. To be frank though, what really gets on my nerves is run-on sentences, which are basically EVERYWHERE nowadays.
Affect:
1[ German Affekt, borrowed from Latin affectus ] : the conscious subjective aspect of an emotion considered apart from bodily changesalso : a set of observable manifestations of a subjectively experienced emotion… patients … showed perfectly normal reactions and affects …— Oliver Sacks