Friendica (@news) is a very flexible Fediverse server type with lots of useful options and a Facebook-style web interface with no character limits (or at least I couldn't find one!).
Friendica lets you follow Fediverse accounts from Mastodon etc., but it also lets you follow RSS and Twitter feeds, or turn RSS feeds into Fediverse accounts that people on other Fedi platforms can follow.
There are also extra features like calendars and groups.
The flexibility does make it a bit trickier to use, but once you get the hang of it there are things you can do on Friendica that aren't possible on other Fedi server types.
There's no dedicated Friendica app, but if you have Android you can use Friendica through Fedilab (@apps), and of course it has a web interface that works on all platforms.
Friendica supports forums and this is what actually works similar to Guppe. The groups in Friendica is similar to lists in mastodon, you can use it to filter your timeline and only view posts from certain users. But unlike Mastodon, Friendica also allows you to use these groups for setting your post privacy, see this - https://fosstodon.org/@futureisfoss/108906119604142120
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