Communication symmetry

There are at least two people in any collaboration, and we can classify collaborative applications by communication symmetry. Here are the classes with a few examples of each:

One to one: email, instant messaging, VOIP call
One to many: blog, podcast, static Web site
Many to many: listserver, threaded discussion forums, VOIP conference call

Bear in mind that there may be gray areas. For example, a blog may have several contributing authors and allow limited feedback from the audience in the form of comments.

Also, a given Web site may have a mix of applications. For example, on Amazon.com, the reader review section is many-to-many and the book search and description is one-to-many.

How does Internet communication symmetry compare with that of other media?

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