digio

They want a phone number to register. I tried to work around using a Google Voice number and it was declined. Bummer.

Thanks for responding. I know you put in a lot of time on this all. Originally I signed up for Slack and I apparently got a free trial and was able to search through posts people had made.
Once the free trial ended, it no longer showed me all posts, but only newer ones (I think).

I considered paying, but when I saw the fee they wanted I quickly changed my mind.. I imagine that there must be some open-source free alternative that would work as well, but I do not know what that is just now. I will think it through some more.

There is an application called Streams that connects with the Fediverse that might work: https://codeberg.org/streams/streams

Since so many people are transitioning out of Twitter to Mastodon, maybe something that is accessible from the Fediverse might be a good alternative.