Reddit is just a forum with a non chronological sort. The entirety of the voting code can be a one liner. Adding upvote buttons is also a one liner. It’s pr

Reddit is just a forum with a non chronological sort. The entirety of the voting code can be a one liner. Adding upvote buttons is also a one liner. It’s pretty easy to do the Reddit MVP but all the stuff they added later on is a major project. That includes their gamification, avatars, spam code, moderation, wiki, chat, private forums, etc. As for Twitter, the east part is making it. The hard part is making the backend scale. Even Twitter inc. itself took months to make it scale (remember the “fail whale”?).