Just some curmudgeonly thinking, inspired by trying to understand "results" from various "blog search" (and I use that term guardedly), engines. What if that dreamy long tail, the one with the cute, clean little infographic, implying vast commercial potential, is really the equivalent of Florida swampland? A thriving ecosystem indeed, but not exactly human hospitable. Really messy, somewhat shallow, dirty, hard to slog through, easy to get lost in, and chock full of hazardous critters and parasites.
As Greg Linden notes, it's tough work to get the crap out.