Excerpt from this article on crossword puzzles comment sections acting as a social network:
People are commandeering the comments sections of The Guardian’s daily crossword puzzles to discuss their families, lunch plans, and even their love lives — but they’ve never met each other in real life.
Each day, these committed crossword enthusiasts complete The Guardian’s online puzzles. While some people use the website’s comment section to weigh in on tricky words and possible puzzle answers, a subset are using the section as their own personal hangout.
Their conversations look more like what you’d expect to hear between two friends, rather than strangers on the internet.