POSSE is along the lines of a higher set of principles to aspire to: in essence where some system under your control is the first place that you publish your content (social posts. blog posts, photos, pretty much any of your content)...And then, your content gets sent out to other distribution points (e.g. facebook, twitter, etc.). It basically increases the value of your web presence to a system that you can control, instead of depending on an outside platform that may not have your interests as its primary goal. While GNU Social is one (out of many) types of tools&#x2F;platforms that can implement&#x2F;help achieve some of those POSSE principles.  See also: <a href="http:&#x2F;&#x2F;indiewebcamp.com&#x2F;principles" rel="nofollow">http:&#x2F;&#x2F;indiewebcamp.com&#x2F;principles</a>