When someone types "posted on X" in no way does anyone think someone posted something to a letter. They know it means X the social media platform formerly known as Twitter. So, really, there's no need to keep doing this parenthetical.
That isn't necessarily true, it takes a long time for everyone to know something.
It doesn't cost you much to glaze over the parenthetical but helps a lot for the couple of readers who won't understand.
Especially since Googling still doesn't work, here are the results in order: the Twitter handle, the film, the app (The X app is the trusted global digital town square for everyone. With X, you can: - Post content for the world to see and join public conversation), the movie a few times, the band, a bunch of pictures and finally Twitter is rebranding.
Note the handle and app don't mention Twitter except in an unhelpful way.
Pretty sure the actual one is the last link on the first page.
