Any of you guys remember back in the day when BBS's were popular? I used to code a bit for WWIV BBS software (games and mods mostly) They had a feature that would allow you to network with other BBS's and share a common forum posts. for example Classified Ads/For sale. At certain frequency the site would sync up and download new posts, and upload new posts. You could see a master list of all allowed forums to subscribe too. Kinda like taking a RSS feed and adding the posts directly.