I think autocorrect is responsible for a lot of apparent mistakes.
Even proof reading doesn't always pick them up, as autocorrect replaces one word with another, so there are no spelling mistakes for the eye to spot. I noticed one of mine earlier - I was droning in a meeting instead of doing something 'during' a meeting ?.
For some reason I always spot my typos/mistakes as soon as they are posted, but not necessarily when I preview them. An edit button would be such a help, even if it only stayed live for five minutes after posting.
He has done it! The toolmakers son has resigned!




Its even being highlighted for me in this post as being misspelt! But then I never know where to put the apostrophe in "its"....