One characteristic that all these programs share is the ability for anyone to share information quickly and easily. These programs provide users with a medium by which they can post information in the form of text, pictures, videos or even music. This allows for the communication of new ideas (or even old ones) to occur in a place where everyone and anyone can see. In addition to new information being shared, users are also able to comment on and even modify (in some cases) the information so that it can be better organized and thus more easily found.
These characteristics of Web 2.0 programs facilitate communication and the sharing of ideas, thus allowing for interactive learning to take place. For example, someone may post an article to their blog which someone then reads, they reader may then have a question about the content of the blog so the reader posts a comment on the blog with their question. The owner of the blog then responds to the readers question thus creating a system of interactive learning (analogous to learning that takes place in a classroom, but is certainly not a substitute for).
Thanks for pointing out how the ease of use of the Web 2.0 applications also facilitates their use.
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