A MessagePostingSystem? is PosterCentric? if messages are primarily organized around the poster, and not according to some other criterion (such as topic). An OpenWiki, such as this one, is not PosterCentric?. The classical non-PosterCentric? system is UseNet. A PosterCentric? system can be SpamProof, because users reading messages can use poster as their primary criterion for selecting messages to read. -- PhilipDorrell