Facebook promotes your page, and posts onto other people's timelines and newsfeeds according to how many likes, comments and shares you get.
So post a link to your permaculture related facebook page here and not only do we get to see pages run by likeminded people, but we can mutually like and share posts. Like this we all grow our online presences.
Here's my page documenting planting trees and improving the land in a dry rocky area of my sub tropical volcanic island home:
https://www.facebook.com/TFSForest
IMPORTANT.. don't just like the pages, go into the content and like and share the posts, comments and pictures you find interesting, and add your own comments. This builds the facebook ranking and gets the content promoted.
Finally, spam kills the internet, so don't just do this for the sake of it, hopefully we really will like the content we share with each other as fellow permies, so let's be a bit discerning and reward good content.