• That would be the question. You can certainly do a site search. At least duckduckgo can do that. It may not be so easy to just search lemmy, the threadiverse, or the fediverse for example. Do not know.

    • All search engines do this. You can append or prepend site:<domain name>.<tld> and it will filter by site.

      They even do wildcards, so to search any lemmy instance with “lemmy” in the domain name, you could do site:lemmy.*

      To include others, you can us an OR operator.

      So to include kbin.social you could use the following filter: site:lemmy.* OR site:kbin.social

      Unfortunately, this won’t work for instances that don’t have lemmy in the name.