As most anyone reading my blog already knows, the Intertubesweb, with its concomitant reduction in communication, collaboration, and computing costs, has dramatically increased the ability of small groups and individuals to innovate and impact thousands or millions of other people. Even if you know all that, Seth Godin's wonderful new book "Tribes", is well worth the hour you'll spend reading it. Tribes dives deeply into the drivers and implications of these changes. Tribes, communities built around ideas and leaders, thrive on curiosity and change. For organizations dependent upon stability -- Godin lumps them together as "factories" -- tribes are a heretical threat. Rather than engaging, growing, and changing with tribes, factories tend to fight them, succumb to fear, and are swept aside as the world changes around them. Godin exhorts everyone to find their movements, their tribes, and to meaningfully lead or engage. As with all his writing, "Tribes" is passionate, persuasive, and well worth reading.