The core of Reddit is extremely simple. A user posts a link and other users can vote. I love Reddit’s initial architecture because it matches. It’s dead simple.
Reddit was initially written by Steve Huffman in the span of a couple weeks in Lisp.
They ran all of Reddit on a single computer that ran both the Lisp process and Postgres.
The database only had a few tables: links, votes, and users.
Steve Huffman explains it here.
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