If you're rational and you want privacy, I would not use a social network. Certainly not as an identifiable user. Reddit is run well, but they are still a) a privately owned company where their main value is you, the user, and b) beholden to laws about e.g. gagged national security letters.

Also, privacy here is privacy from reddit and the government, not privacy from an unprivileged person. I think the distinction is valuable here.