I had no idea. I have fought with friends, family and colleagues over this for years. I am decidedly on the “anti” team unless the comma is absolutely necessary for clarity. In that case, I normally rewrite the sentence to obviate its consideration.
via The Best Shots Fired in the Oxford Comma Wars | Mental Floss.
And I’m also retaining the right to use the letter Z instead of the S in Organize, Optimize and Recognize. This is purely for egalitarian reasons as Zed just doesn’t get the love it should.