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I just shared this post on twitter for instance, soon you'll see poshtoken comment with an embedded link to the tweet:

Now if someone else had shared it I could've thanked them by voting the comment up and they'd receive the rewards along with earning POSH depending on how well the tweet did.

I see. Thanks for the info on this.

It doesn't do anything on Twitter, it just places a comment under the hive post you shared there. You just need to include the hive post link and the #hive tag in the tweet and be registered to receive rewards.