Lemmy appears to be very similiar to Mastodon, with decentralised servers to prevent musky spezulence.
Just a bit confused as i’ve tried Mastodon using the Tusky app and it felt like twitter but decentralised, whilst Lemmy feels like reddit but decentralised but language such as fediverse is shared.
You can’t yet, not conveniently anyways. I’ve seen exactly one post from Mastodon on Lemmy so far, and it was a post testing if it was even possible at all. The formatting was pretty fucked up so it’ll probably be awhile until it’s an actual feature rather than just a technical possibility.