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If you aiming for community discussions and link sharing, first things that come to mind is https://www.discourse.org/

No. I want to setup my own like the same one as YC

Discourse is open source forum/discussion software that you can host yourself. Youcan also find services that will host it for you for a price.

You can use an older version of the same codebase here: http://arclanguage.org.