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 9 days ago 

The blockchain has a built in promotion mechanism. Before payout time, if someone sends any amount of SBD to @null with a memo in this format:

Then the post will show up on the /promoted page. The list is sorted by total promotion amount (in descending order). Each community and tag has its own sub-page with promoted posts, too. i.e. Here is the "promoted" page for Steem-Dev.

More on that, here and here. This and @null beneficiary rewards was the origin for the Steem Curation Extension. It was introduced at about the same time as the launch of the #burnsteem25 program by SC01.

By default the only way to see that a post has been promoted is to go to that page, and nobody ever remembers to go there. So, I built a browser extension that tells me at a glance if anyone is promoting posts in my feed or making use of @null beneficiaries, and I make sure to give those posts curation attention. The turquoise outline that you see in the post above is added to promoted posts by the browser extension. It doesn't exist in condenser.

interested. There are many things that are hard for new users to notice because they're outdated.

 7 days ago 

Agreed. It's possible to learn about much of it by reading the historical posts from @steemitblog, but many of those posts have probably also become outdated.

It is indeed interesting, thank you for explaining.

Thank you for asking.