Wanna Wanna Wiki #16

Maybe it's just me, but the wikis I looked at seemed more like regular web pages or blogs. I didn't look at everything, but with the ones I explored I didn't see that you could alter or add information the way you can in Wikipedia. I thought the idea behind wikis was that you could do that. I thought the information provided on some of the library ones was kind of cool, such as the one where patrons could review books, but exactly how does that make them a wiki?