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4chan
4chan (https://4chan.org/) is the most famous image board and a place where a lot of most memes are born. As image boards typically do, 4chan has a nice, oldschool minimalist look, even though it contains shitty captchas for posting and the site's code is proprietary. The site tolerates a great amount of free speech up to the point of being regularly labeled "right-wing extremist site" (although bans for stupid reasons are very common, speaking from experience).
For us the most important part of 4chan is the technology board known as /g/ (for technoloGEE). Browsing /g/ can bring all kinds of emotion, it's a place of relative freedom and somewhat beautiful chaos where all people from absolute retards to geniuses argue about important and unimportant things, brands, tech news and memes, and constantly advise each other to kill themselves.