You are right with your last sentence, but reddit is anything but niche. It attracts even politicians and other celebrities, albeit typically only for Q&As. Arnold Schwarzenegger and William Shattner post there for fun with their real names, who knows how many post under pseudonyms. The beauty of reddit is that it attracts even non-technical people who share their insight in their domain (usually anonymous, so to be taken with a grain of salt - but it's usually plausible precisely because reddit is so popular).