From an article from the NY times:
What do we call tweets?
Tweets are now posts. In the same app update that wiped out the bird logo, the company swapped its classic blue “tweet” button for one that says “post.”
Some users have proposed other names for posts. One suggestion has been “xeets” (pronounced zeets), an X-themed play on tweets. Others suggested “xcerpts.” None of these terms seem to have caught on in a big way, at least so far.
Post, Xeets, or xcerpts... have at it, folks.
D3