POSE is an acronym for "Publish Once Syndicate Everywhere" which is conceptually similar to but looser than POSSE, which asserts that the "once" be on your "own site". POSE has been subsumed/superseded by POSSE.
The phrase "publish once syndicate everywhere" has appeared in a few places in the past. If you find earlier references / permalinks, please add them with a blockquote of the context of the phrase.
- 2011-08-06 Digital Outsider from MediaPost/ Cisco Gets Into DOOH 08/05/2011
[...] a principle I call ‘publish once, syndicate everywhere.’
- 2011-11-23 email Re: Faculty listing
One of our overarching goals is to promote a ‘publish once, syndicate everywhere’ model.
- 2012-06-21 at last night's #microformats 7th celebration
[...] we think it improves on "POSE" - Publish Once Syndicate Everywhere.(earliest findable reference to the POSE acronym, though the context implies it was defined previously)