@davew @davew Mastodon is written in Ruby on Rails. It doesn't scale, except through expansion of hardware capability. Pleroma is written in Elixir, which runs on the Erlang virtual machine/library. Erlang/OTP was designed to run the Swiss cell phone network. Properly used, it scales. HUGE. I can't speak for whether the Pleroma authors used it properly, nor for how well ActivityPub scales. I haven't investigated either.

My personal Pleroma server runs fine on a $5/month Digital Ocean VM. I've read that an old 32-bit Raspberry Pi is sufficient to run a 100-user Pleroma instance.

I plan to upgrade impeccable.social to use Soapbox/Rebased, a Pleroma fork. @alex is hard at work, adding new features.