I can't even figure out how to use it from my mobile device without installing an app.
I believe that's deliberate. The mobile web version of Facebook used to support personal messaging. In 2016 they removed it in an effort to push people onto the app.
https://techcrunch.com/2016/06/03/facebook-is-disabling-mess...
Going to https://mbasic.facebook.com/messages gets me the following:
> Your Page's Inbox is not currently available in the > Facebook app or mobile web browsers. You can access > your messages through a desktop browser, or by > downloading Facebook Business Suite or Messenger > from the app store.
In one comment on HN[0], a user suggested:
> You may need to access the page by clicking a link > from another mbasic page in order to have some kind > of checksum in the URL.
Another user replied that they were able to get access to the page with that method[1], but I haven't been able to replicate it.
[0]: https://news.ycombinator.com/item?id=25402316 [1]: https://news.ycombinator.com/item?id=25402354
It even has some extra features, like LaTeX support.
I guess you mean it doesn't work on mobile browsers? (Never tried that)
It’s basic (like it says on the tin) but it works. I use it to avoid having to install the app, for all of them reasons discussed.
