I can't answer the question "What is the Origin of keep you posted?", but I can say that now, at the end of December 2010, it's a widely used and recognized expression at my company. I work at a large Southern California-based video game publisher.
the origin of social difference
Mexican origin.
it is of German origin
The word "origin" is derived from the French word "origin" and the Latin word "originem," both of which mean, beginning, descent, birth, and rise.
germany
The duration of Keep Posted is 1800.0 seconds.
Keep Posted ended on 1954-01-18.
Keep Posted was created on 1951-10-09.
It means "keep you informed of the latest news." If someone was in hospital and you wanted to know how they were, you might tell their family "Keep me posted on their condition."
We will inform you accordingly
The bible
Keep me posted.
keep the griseous orb with him
You have to keep on reporting them and keep on reporting their background and keep on flagging them and keep on blocking them and keep on thumbing down their comments and keep on removing their comments and keep on marking their comments as spam and keep on removing topics they posted in groups and keep on marking topics they posted in groups as spam and keep on marking their messages as spam and keep on deleting their messages.
It could mean one of the following: "Keep me informed" "Stay on top of it and keep me in the loop"
sure hope so,keep me posted!
NO, not that I know of but I will keep you posted if something changes.