Libreture promotes DRM-free ebooks, has a directory of DRM-free bookshops, and provides an online ecosystem (storage, reading lists etc) specifically designed for DRM-free ebooks. You can follow them at:
Their site is at https://www.libreture.com
(DRM-free means that you can keep the book you buy forever, and use it on any device you choose, even if the bookshop closes down.)
This is a brand new server run by the main developers of the project as a spin-off of mastodon.social It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!