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Upvote? Click on the circle-like thing to the left of a comment or post. As for a subreddit equivalent, there isn't really one - you follow people, tags, and/or domains. You can sort of fake it by posting things under a specific tag though.
thenewgreen · 3590 days ago · link ·
Also, you can use personal tags on Hubski which people can follow and that are specific only to you.
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YetAnotherAccount · 3590 days ago · link ·
There's no way to whitelist other people to post under your personal tag, though (well, that I know of), so it's a help but not really a subreddit equivalent.
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ButterflyEffect · 3590 days ago · link ·
Nonexistent, fortunately. Refer to this post for some discussion on that front.