Keep you posted

Posted by Victoria S Dennis April 08, 2008 at 17:51:In reply to Keep you posted posted by Ann on April 08, 2008 at 09:22:

What is the origin of the phrase "keep you posted?"

If you "post" someone, you provide them with information. (The metaphor is of sending them a letter or bulletin.) If you "keep them posted", you do so regularly. (VSD)