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Firefish Mastodon alternative
(joinfirefish.org)
This is a most excellent place for technology news and articles.
Unless they recently changed things, the creator said specifically that he isn't going to add the character limit as an option. I can understand that since sometimes you need to restrict certain features based on the goal of the project. I think it would be fine because I don't think it will turn into Medium since the interface isn't really set up for that.