RULE OF THE INTERNET:
All typos only become visible the moment you hit send or the equivalent.
@Elizafox Sounds like my thesis.
@apo An Extensive Look at the Phenomenon of Accidental Grammatical, Spelling, Logical, and Topical Errors Unnoticed by Social Media Authors Until Published.
I bet it's on JSTOR right now.
@Elizafox Also: other's typo are only visible when you desagree with them and want to shut their mouth
@Elizafox also, if you correct someone's spelling or grammar, your correction also contains a spelling or grammar error