This user does not put two spaces after a full stop.
splice
Comma splices are annoying; this user fixes them all.
A,B,and AandB
This user uses the serial commaunless its inclusion is confusing.
its & it's
This user understands the difference between its and it's. So should you!
’s
Thi's user know's that not every word that end's with s need's an apostrophe and will remove misused apostrophe's from Wikipedia with extreme prejudice.