I've taken to suggesting people read https://mastodon.help/ before they bother. It's not perfect, either, but I like to kid myself that it helps avoid the "I DEMAND THAT THIS BE LIKE TWITTER" thing.
I giggled at them trying to explain Mastodon, though:
> There is no such thing as a social network called Mastodon! Instead there are thousands of independent social networks called Mastodon Instances.
...three paragraphs later...
> When we say “Mastodon” we mean the whole network of Mastodon Instances
I know what they were going for, but it seems to undercut itself. :)
Is there a summary that can be read <5 minutes?