Web 2.0 Confusion

Jason Kot­tke has a post about word fre­quen­cy analy­sis on Web 2.0 def­i­n­i­tions by design­ers. I was real­ly sur­prised to see that nei­ther social, inter­ac­tion, nor com­mu­ni­ty ranked up at the top. Did I com­plete­ly miss out on what Web 2.0 is all about, or was it all just the ajax fad? I don’t sup­pose it mat­ters, since I don’t design. Just a curi­ous, and pos­si­bly telling, result.