Wikis Wikis

What I learned about Wikis is that they let multiple users add, remove and edit content and you don't need to understand HTML. My concern would be the accuracy of some of the wikis, can you really trust the content as being true. Over all I like the idea of them I like the example they gave in video about the friends going on a hiking/camping trip, I think it would be great to use if your planning a family reunion and you have people all over the country that you need input from. I liked Wikipedia I know my daughter uses this one alot. I have never used a Wiki before but now that I am more familiar with them I will be checking them out and maybe find one that I can put information on myself.