Libre Lounge @librelounge has nice on Libre matters, in particular a series on , starting with "What is Federation" and then digging into it with a "Part 1 / 2 / 3" set:

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En OSM Town | Mapstodon for OpenStreetMap

A Mapstodon instance for the OpenStreetMap Community (English language)! This site is under construction, and may change. Our francophone friends have a Mastodon instance: