who owns web 2.0?

who owns web 2.0?:
Via Tama Leaver, I found this great overview of who owns what from Amy Webb– as you can see, Google, Yahoo and the rest are far more likely than Murdoch, at this point, to end up controlling our media lives in five or ten years time. Amy Webb suggests printing it out from the PDF and hanging it up in your cubicle. I need something for my office door: this might be it.

Jill points us to this excellent graphic showing who owns which web 2.0 companies. the concentration is pretty clear, but what does it mean for academics? or students?