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Yup, there are some differences between social media... Reddit can be stricter in some questions because, for example, you can get hundreds of upvotes or even hundreds of visitors (to your website) with a new Reddit account on day 1. It's quite unique. Despite this, they officially don't mind people sharing links. They just want people to engage.

But also subs have often weird rules, and not just to share links or drop a text post, even to comment, I have seen some and I was like "come on one can't even comment here"