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Newsletter platform Ghost adopts ActivityPub to ‘bring back the open web’
(www.theverge.com)
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
Of course it matters. A new network will have to start from scratch and with the "nobody is there, so I won't join"-mentality, potential growth is severely limited. By implementing federation, you will instantly have a base community to build on.