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That's fine as long as they're compatible with each other, isn't it? Different software, same social network.

...But they're not. Are you using diaspora, pump.io, gnusocial, or something else? Sure, there are bridges, but they're kind of awkward.

I can't speak for Diaspora but Pump.io, GNU social and Mastodon don't need bridges, the users are actually equal.

Indeed. Which is why they weren't mentioned.

pump.io and OStatus are not compatible.