It's "federated" in that it runs on simple web standards and protocols. You can use almost any CMS or platform out there and pipe your RSS,ATOM,JSON, or other feeds into it. If your site supports the Webmention protocol, then any comments made by other micro.blog users will come back to your original post where you can choose to display them (or not). https://indieweb.org/Micro.blog may give you some additional ideas/help.