I've started a new group "Way Out There" http://www.aarp.org/community/groups/WayOutThere
It's under Religion & Beliefs/Paranormal. It's a place to discuss topics that folks may or may not believe in. Examples include: Mayan Calendar, Nostradamus, Edgar Cayce, Polar Shifts, Guardian Angels, Psychic Phenomena, Doppelgangers, UFOs, etc. Membership is open (you don't have to have in invitation to join).
I've been on a lot of other message boards and have encountered a lot of theories. I don't believe all of them, but I find them interesting. SInce I am a fan of science fiction, I like to indulge in "what if" exercises. So, what if these theories were true--how would that change our daily lives?