Not officially - but they'll be adding groups in one of their future updates (not 4.2, unfortunately). That will work exactly as you'd expect.
However in the meantime, people use Guppe Groups (https://a.gup.pe/), which are a type of "user" which boosts all posts sent to it to other people following it. For example, I could follow @bikes@a.gup.pe and anytime anyone mentions @bikes@a.gup.pe, the post will be boosted to all other users following @bikes@a.gup.pe.
The above is how Lemmy communities work when followed from Mastodon, as well.
I’ve used this and it worked pretty well. The issue I had was when people start chatting and leave the group pinger in the convo. But that was more of an etiquette issue than a technical issue.
@jay91 It doesn’t but I believe it’s planned for the future. For a classical forum-type groups implementation, Friendica is your best option, for Reddit style, Lemmy and Kbin.
Lemmy is good, but i want to start a community in Arabic, RTL, and lemmy does not support RTL for now.
this is why i'm looking for alternatives.
i don't know if Kbin supports RTL.
@jay91 Group support appears to be in the works. In the mean-time, people on Mastodon can still follow group accounts and those group accounts will boost posts into their followers' feeds. For example, that's how I saw this post to reply to.