mediaanthropology - first meeting - done!

so we had our first meeting and it was great. We decided on what we'll read until next time (mainly articles from The anthropology of media and Media Worlds). What I'm looking at now is if we'll use a wiki or a blog to work collaboratively online. I just found out about socialtext and signed up for it, but then I also discovered the costs! I wonder if jotspot will just do the same, or if we should just use a "normal" weblog or "normal" wiki. I'd love to hear suggestions, and also: as socialtext is building on opensource, is there no similar service that is free?