@IgnacioM
@lemmy.mlEternity (for Lemmy)
Im personally not a huge fan of the portmanteaus. Its hard to make a good one with the word Lemmy.
Edit: In the same vein, it could also be called Eon.
Its like email. Gmail and yahoo mail talk to each other but have separate account databases and administrators. Both of these are general purpose instances so there isnt much difference. I think lemmy.ml is a little more left wing in its moderation.