I’ve found that being consistent with what you choose to share is the most difficult thing. Conversations can get personal, and as you get closer to those random nicknames there’s the constant urge to share mundane stuff about your daily lives like weather, holidays, and such that will all add up.
It’s all about risks vs benefits. You can open up your domain for more users, but that also can make you potentially liable for what other users do with your domain from law enforcement if something nasty happened.