While typing the title i found some existing posts, but they don’t really answer the question as well as I’d like.
The typical recommendation is to use some external web page that is not actually a lemmy instance.
This means if I’m using lemmy from within an app I have to pop into a web browser, find what I’m after copy anything needed to clipboard and pop back into the app ready to paste / re-format / search.
This sounds really not streamlined.
Other solution is to have a couple of accounts and flip between them and search each home instance for what I’m after.
I’m not sure I’m clear on what I’m asking so i’ll give an example…
I’m on lemmy.world, there is a community on lemmy.radio/c/amateur_radio Let’s assume i don’t know this however.
a) How would i find this while logged into the lemmy.world website? b) How would i find this while logged into the lemmy.world via an app?
If this functionality does not exist that’s fine, but all I’ve heard about federation makes me think it does exist and i haven’t found it or don’t understand it (hence why i think I’m asking a dumb question).
Is there a foolproof legitimate way to browse or search a list of communities on another instance without going to that instance or using a third party site?
a) you don’t
b) again, you don’t
In order for off-instance content to appear in search (or at all) it has to have been federated, and only communities that have at least one subscriber from your instance, are federated. If some other community on another instance has no subscribers on your instance, it doesn’t even appear in “All”. To get that first sub, someone just has to “know” and write its exact name in search, for your instance to reach out and establish federation of the off-instance community. Most apps can’t even do that step, you have to do it via the webUI, though I know Thunder can do it since a recent update.
The reason an instance can’t search the entire fediverse, is that it doesn’t know about the entire fediverse.
External web pages like lemmyverse.net don’t either, but unlike instances they go out looking for what’s out there, rather than only connecting to communities at least one user has told it about like the instances do.
The idea is to only cause federation traffic between instances where its actually wanted. For a truly fediverse-wide search, every time you search, your instance would also have to ask every other instance for search results, then return and compile those thousands of results from thousands of instances. It’s not a sane way to do things.
In the future, it’s more likely that instances or clients will connect to “search providers” like lemmyverse that maintain indexed databases of the fediverse, and be able to get results without hitting the actual network with a search query at all. It’s possible some form of more advanced indexing will become a part of the instance server software itself.
But vry little work around this has been done, but you can see it in places. Thunder, the client I’ve worked on, only has basic search right now, but there has been talk about solving this problem within the app, eventually, by providing results from lemmyverse.