This user prefers to use the serial commaonly when its omission can be confusing.
its & it's
This user understands the difference between its and it's. So should you.
its it's
It's really not that hard to use each word in its proper manner.
its
This user understands the difference between its (of it) and it's (it is or it has).
’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.