Public chatrooms were everywhere too. It was just the default, anywhere you went. AOL, yahoo games, random websites for no reason.
Even as late as Starcraft 2 (so 2010-), you’d open the game and immediately be dropped into a giant public chatroom on the home screen with everyone else currently playing.
I got an invite for Gmail from a Yahoo Messenger chatroom, about two months or so after the service opened up as an invite only email service.
I remember it very well. Some kid comes in, and says that his mother traded 12 lbs of peanut brittle on a website called Gmail Swap (where people were trading random things for Gmail invites, instead of money) for a bunch of invites, however because she grounded him he thought of enacting childish revenge by just freely giving 12 invites to anyone who asked.
The Internet was wild.