Library/Web 2.0?

I'm not a huge fan of catch phrases and 2.0 appears to refer to a bundle of things. I completed 3 1/2 of the 4 activities. (I kept zoning out during activity 3.) I think I got the gist of 2.0, but I couldn't define it succinctly if my life depended on it. (Apparently, I'm not alone.) Essentially, libraries and librarians must provide the technology and know-how that patrons need in the current Internet environment. That is why I'm here!