A History of Short Words

From the New York Times Crossword Puzzle

ITSME

Mon, 27 Jun '22
Reply to "Who's there?"
Sun, 26 Jun '22
Exclamation while seeing oneself on the Jumbotron, perhaps
Sun, 17 Apr '22
Response to "Who's there?"
Fri, 4 Feb '22
Part of a classic breakup line
Sat, 6 Nov '21
Response at the door
Sun, 9 May '21
Apologetic remark during a breakup
Sun, 11 Apr '21
"Who's there?" response
Wed, 20 Jan '21
Self proclamation?