This article is from the Naturism FAQ, by Dennis Kirkpatrick firstname.lastname@example.org with numerous contributions by others.
4a. Internet Relay Chat (IRC)
Naturists gather in several channels on several different IRC
networks. Due to the transient nature of IRC channels, a list is not
possible. Look for channels named #nudists, #nudism, #naturists, etc.
4b. Instant Messaging.
Instant messaging is available from various providers. AIM (AOL Instant
Messenger which links to all other AIM users and AOL's Buddy List for
AOL account holders), MSN Messenger (links only within MSN) and Yahoo
Messenger (Links to only other users of Yahoo Messenger). Programs allow
users to direct-communicate with your acquaintences when they are