99% of my posts are tapped out one character at a time on my smartphone. It has a combination word recognition and spell check program (somtimes known as autocorrect) that works quite well, but occasionally has a miscue.
If you are not familiar with word recognition, after the first few characters of a word are typed, the program predicts what you are trying to spell and automatically completes it moving on to save time.
"To" and "too" are two words often screwed up by autocorrect and easily overlooked upon proof reading the text. "Sh*t" often appears for "shut" so I really have to pay close attention because you never know what will be inserted, usually the word used most frequently and apparently I use "shut" less.
I give everyone the benefit of doubt when it comes to spelling or grammatical errors because sometimes spell check isn't used or an autocorrect substitution is made which is simply over looked during proofreading because you knew what you meant to type.
For a little more humor on autocorrect jackpots people have gotten themselves into, look here: http://www.damnyouautocorrect.com/