People always of think of the algorithm as something that delivers content -they don't think about the things it filters out.

For many on traditional social media it's an expectation, even if they're being lied to (they're only seeing a subset based on language, preference, and a thousand other metrics).

On the fediverse it's more plainly visible that you're not getting everything, but that can be a feature, too, not a bug.

Why should I care about seeing everything the whole world has posted about dogs, etc?

I should be able to find everything if I look for it, but not seeing everything by default makes it more of a community vibe.

• Category (forum) ≈ community (link aggregator)
• lemmy, mbin, piefed are link aggregators. That meant we mainly share link in a community and talk about it in comments.
• on forum, you there are several post in a category. They rarely share link, content. They are more geared to the discussion on a topic and share link
• The difference is the UI. Julian is the cofounder of nodeBB. See his forum : https://community.nodebb.org