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post on (something)
1. To share information on a public place, thing, or platform. He spends so much time posting on social media that he has started letting his relationships in real life deteriorate. You should try posing on the notice board in the post office—I've seen a lot of great services advertised there.
2. To share a particular piece of information on a public place, thing, or platform. He posted some pretty inflammatory comments on Facebook over the weekend. We're posting pictures of our missing dog on buildings and lampposts all over town.
post (something) to (one)
To send something to one via the postal system. I posted that package to you weeks ago—it must have gotten lost in the mail. I'm posting a letter to you this morning with details of our trip.
See also: post
In basketball, to assume an offensive position between the foul line and the basket (known as the low post) with one's back to the basket and a defending player. Post up, Johnson, post up—you're twice the size of the man covering you!
post something up
to record a transaction in an account. I'll post this charge up right away, and then you can check out. Please post up the charges a little later.