"a posting" is correct and can be used in written English.
For example, you can use it to refer to a notice, announcement, or advertisement published: "She saw a posting for a job at the store and applied."
We never made such a posting".
From a posting by Emily Weinsteinon Diner's Journal atnytimes.com/dining.
In September, he saw a posting for a "burial welfare supervisor".
A Review of the Evidence," a posting on the New York Fed's Liberty Street Economics blog.
In a posting on his Web site announcing the closing, he sounded more hopeful than dejected.
"This man is a traitor," wrote one critic in a posting on a jihadist Web site.
Or, perhaps, a posting to a rebuilt American consulate in Benghazi.
But, at the end of a posting in Washington, this writer has second thoughts.
"She's a real actress, don't you know," read a posting on Gawker last month.
"I saw a posting for an internship at Elizabeth and James.
Mr. Savitch, 29, is studying Thai language in Washington before a posting to Bangkok.
