I first heard the term "blog" in spring 2004 in my Intro to PR class at BU. I spent about three weeks wondering if I was hearing Prof. Quigley right and trying to listen closer because obviously "blog" was not a word. It was a word and I finally had to Google search it. Ah - web based log.
And I love that in the past few years it has become part of a virtual social fabric of far-flung friends. After all, what's this thing called social media if not social?