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Mastodon down?
(lemmy.ml)
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
Mastodon can't be down just like the entire Internet couldn't be down. A Mastodon instance could be down. You didn't tell us what Mastodon instance you use (like, what's your Mastodon username), so it's difficult to answer your question.
For example, if you're @joeschmo@mastodon.online, you could check if mastodon.online is down.