According to their ad page, 4chan has 22 million monthly visitors, which is not as large as Twitter’s 300 million, but I would argue is also not insignificant:

According to their ad page, 4chan has 22 million monthly visitors, which is not as large as Twitter’s 300 million, but I would argue is also not insignificant: https://4chan.org/advertise https://4chan.org/advertise