The best replacement for chat rooms is forums.

The best alternatives to chat rooms are rated as following:
★★★★★  forums
★★  message boards
★  chat lines
★  websites
★  instant messaging
★  blogs

Your alternative for chat rooms is not listed? Suggest!
Speaking about chat rooms, one probably shouldn't forget about messenger.

Other search terms related to chat rooms and their ratings are:
★★★★★ messenger
You have in mind a companion for chat rooms and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of chat rooms in all years. Click on graph for more.
chat rooms
forums
message boards