Will this reply show up in Mastodon??

Ah, wow. It does!
Forgive my ignorance but what is a Mastodon? I only ever heard it to be used as a animal
It's a federated Twitter alternative. It's existed for a while - the initial release was in 2016, but obviously with all the Musk-related nonsense in the past few years, it's grown a lot.
It's a federated service like Lemmy, but built to be a Twitter clone instead of reddit.
I would be so hyped to see a true dual Lemmy mastodon service that fully allows you to browse and post to both Lemmy and mastodon style feeds. Currently even kbin is really more focused on the Lemmy / piefed end and the microblogging function still requires the posts to be under a magazine meaning masto posts aren't really browseable and they're not really fully interact able from both ends. I feel like a service fully compatible with both formats would give a broader reach that would really allow fedi to grow. You'd be able interact with like half of fedi at the same time which would make it feel so much bigger and more comparable in scope to traditional social media.
You should give an explanation on how to do it
I've tried explaining the fed to my friends and family like "it's like insta and FB and xitter and reddit all got to talk to one another and there's different organizations like email has". I'm not sure they get it much better.
I just explain but starting how you can email gmail from Outlook and such ( familiar concept). Then tell them you could email a Facebook account using username@facebook.com (this shows they were open to it at some point), that it was a default state of things because they wanted you connected. But then they realized they can make you sign up to their own website and make more money, so now we need account for everything. But imagine you didn't, you could access different contents in the UI/format you want. You don't need to share screenshots of different social media (shows why it's useful), you could just follow different people from different websites.
So far this explanation has worked. I haven't converted anyone, but they understand. Sometimes they try to install and see, then say "the things I want are not here" because we don't have all the niche
I've converted no one. But I get the most tempted looks when I say: there are no ads, and when you search for anime, noone is adding that to their secret database of your likes
This didn't work for me. Did I do something wrong?
IIRC you must be following the community with your Mastodon Account to be able to post there. At least that was the problem, when I tried it the last time.
I tried again, this time after making sure to follow the community, but it still failed.
Although I cannot remember how to do it "correctly" I have a suspicion whats wrong with your post:
Mastodon just has a "text" for the post, some mentions and maybe media attached to it.
Lemmy also features a post title and an URL. IIRC the first paragraph of your post get converted to the title, the remainder is the post body (maybe you need to put the desired link second?!). I guess your text in the first paragraph is too long to fit in the title and the post is discarded.
Try something like this:
ICE Tucson, AZ - 2/7/26
Fascist paramilitary invaders deployed...
Source: reddit.com/...
Can you post new threads from Mastodon, or only comment to existing threads?
Both! If you notice this thread was made by a Mastodon account.
Thanks - how would I do that? How to choose the community from Mastodon?
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