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Mozilla.social sent out a slew of account invites to their waitlist
(mozilla.social)
This is a most excellent place for technology news and articles.
I've been on it for a few months now. It's basically just Mastodon with the Elk skin, but using Mozilla Accounts for authentication. I think there are a couple more bells and whistles added as well. But overall, I think it's just a starting point from which they'll develop something more custom.