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Typically they're written with an `@` prefix, which implies that it may be a handle that supports WebFinger: https://en.wikipedia.org/wiki/WebFinger

WebFinger technially uses a `acct:` URI protocol scheme, but this wouldn't work here. Lemmy writes community refs with a `!` prefix, which is somewhat unusual.

True:

https://lemmy.world/c/selfhosted

In general with the fediverse you go to the domain after the @ and over there use the search box to find the part preceding the @. In this case that leads me to https://lemmy.world/c/selfhosted

I think those in the bubbleverse think of that as a feature, not a bug.