Stop Grammar Policing the Word 'They'
by Beth Skwarecki from Lifehacker on (#4WCHK)

If somebody wants to refer to a person whose gender they do not know, or who doesn't have a gender, they can use a certain very common English language pronoun. You know which one I mean. I just used it twice. Congratulations to they on being Merriam-Webster's word of the year.