Instead of one central Reddit, imagine hundreds of mini-Reddits each with their own users, communities, rules, culture, etc. Now connect them all together so the users on each mini-Reddit can read/post/comment on any of the others. That basically how this works; each Lemmy instance is a mini-Reddit in a sea of peers.
There are so many politics communities, but before you mentioned this I didn't realize how concentrated they are on .ml and .world. These look like the most-subscribed USA and World politics communities that aren't on .ml or .world:
[Edit: Though I listed them here, the hexbear and beehaw communities are not accessible to large swaths of the Lemmy user base due to instance defederations.]
Supposedly this is at Beth Israel Deaconess Hospital in Plymouth, Massachusettes. I would not be surprised at all if it's real; having a Dunkin' Donuts in the hospital would totally track for Massachusetts.
When viewing the lemmy.world main page it should be on the right side:
Note that it isn't visible when you a viewing a community.
This is normal behavior for the default Lemmy UI.
Here is the Lemmy developers' GitHub page, where you can open issues to request changes: https://github.com/LemmyNet/lemmy-ui
What interface are you using to browse Lemmy? A mobile app like Voyager/Thunder/Summit/etc., or the standard web UI, or an alternate web UI like Alexandrite/Photon/Tesseract?
There are lots of ways to view Lemmy and they all offer very different features.
Edit: The web UIs can also look different on desktop versus mobile.
I absolutely know people who started relationships through early Facebook. It was only open to college kids, and the whole site was designed to find likeminded people near to your existing friend group. Anyone remember the "six degrees of separation" feature that would show the chain of friend connections between you and another user?
Instead of one central Reddit, imagine hundreds of mini-Reddits each with their own users, communities, rules, culture, etc. Now connect them all together so the users on each mini-Reddit can read/post/comment on any of the others. That basically how this works; each Lemmy instance is a mini-Reddit in a sea of peers.