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This service lets you add a single character to Hacker News links to add social media and OpenGraph previews for sharing on things like Slack or Discord or Twitter or Teams. Read more about it in the Hacker News announcement here.
Install the Slack application to automatically get previews (unfurls) for news.ycombinator.com links.
It looks like this:
Simply add a 1 to your Hacker News link, such as https://news.ycombinator1.com/item?id=30167605, and you'll see a rich preview instead of a plain URL.
On Slack you'll see:
...or for a comment:
On Discord you'll see:
On Twitter you'll see:
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