It's like a roomful of disembodied voices, all conversing, forced by technology to speak one at a time. Like a living bulletin board, all manner of subjects are discussed in chatrooms. Agnostics and Satanists exist beside Christians and Jews. Religious cults of all types have a presence in chatrooms. Hate groups have their corner of this area, also.
Sex is a hot topic in chatrooms.
Although most Internet Service Providers make an effort to protect children from accessing those specific chatrooms, some of the worst have innocent sounding titles. The very title acts like a pedophile magnet, pulling in children who want to talk to other kids and predators who want to talk to children. Most Internet Service Providers close them down as quickly as they can, but sometimes not before a child has wandered in and been approached by a predator. Other dangers in chatrooms are instant personal messages and private chatrooms.