Plenty has been written about sneakerheads and their blogs. This recent Adweek story is only an update for those in the know, but sneaker blogs are still a phenomenal scene and online industry to behold.
In the 2000 book The Tipping Point, author Malcolm Gladwell laid out a theory about how hit products or movements spread. People who know a lot of people (called connectors) cross paths with mavens. Nine years down the line, it seems that the connectors are unnecessary. Give mavens a blog and access to Facebook or Twitter, and they will rule the category.