Action Forum - Discussion forums with ratings of posts from readers.
Canadian Content Forums - Discussion about issues surrounding Canadians, anywhere from politics to computing to gaming. No registration required.
Cypriana's Corner - Discuss world politics, religion, and issues, as well as chat.
Global Ideas Bank - A suggestion box for socially innovative non-technological ideas and projects, with £1,000 UK sterling awards annually for the best ideas or projects submitted.
I Got Issues - A place to post an issue or to respond to an issue someone else has posted.
If I am... - Members discuss what they would do were they a doctor, a politician, a rocket scientist, and a porn star. Users must select a username and password before posting a new message.
LibertyPost - News discussion forum open for people of all ideological pursuasions to browse and post articles and comments. Boards organized into issue categories.
Mac's Thinktank - Users submit innovative solutions to the world's problems.
The Mote - Self-supporting community discussing issues of politics, war, and a variety of other topics.
Nattie's Speak Your Mind Forums - Forum, debate and message boards: If I Were President forum, and What Really Bugs Me forum. No password needed.
A Question of Debate - Holds discussions on any subject. No registration needed.
Society for Progressive Cognizance - A forum for discussing social reform through diverse means, including technology, philosophy, psychology, biomedics, politicss, theoretical sciences, and methods of global communication.
Time Bomb 2000 - Contains discussions on the end of the world. Free registration required to participate.
Tiny Planet - A forum for people from all over the planet to share ideas, communicate and better understand each other.
Yahoo! Groups: Open Words - Focus:es on freedom of speech. Users must select a username and password to start new discussions or reply to existing ones.