Here are some specific questions.
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Are the upvotes and downvotes I make, private? If I report a comment, is my report private?
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Can someone follow me across lemmy instances based on my username?
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If I want to make a community, is there a reason I would choose one lemmy over another?
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Are the powers of moderators similar to reddit’s?
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Where can I find a list of most active lemmy instances?
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Any other differences from reddit I should know about?
No, this is because of already many abuses, the local admins / mods and the “origin” instance admins / mods can see your name.
Much less but soon with sublinks aw lemmy compatible backend / ui it will become a lot better.
Everything here is PUBLIC, because of federation many things gets federated everywhere even without you noticing sometimes.
Everyone here is unpaid, so mods and admins are here equal instead of reddit admins beeing paid millions for beeing *ssholes.
Here, if you dont like the admin of an instance you can somewhat easily swap to a different instance ( sh.itjust.works, lemmy.today … ), but be aware if you just went out with a “Bang”, like you trolled a lot and got permabanned you wont be welcome in the other instance because the admins are most of the time in good contact to each other, and warn for trolls or harassment.
.world has some other types of software too, https://mastodon.world/ and https://sharkey.world/