Game Making Toolts is a user on gamemaking.social. You can follow them or interact with them if you have an account anywhere in the fediverse. If you don't, you can sign up here.
Game Making Toolts @gamemakingtools
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In light of improvements to what Mastodon does with them I've enabled invites for all users.

So you can invite a friend directly to an instance to make signing up less intimidating for new people.

Better info in this post on the new Mastodon blog: blog.joinmastodon.org/2018/06/