The author defines the tipping point as "the moment of critical mass, the threshold, the boiling point." The book basically looks into the phenomenon of fads and how and why it happens. The author posits that a product, idea or message spread like a virus. First, a virus will go around the population all chill-like, until it reaches a critical mass, or a tipping point, and becomes a full blown epedemic.
Gladwell theorizes that there are three very important things that make a so called "social epedemic". Thing which I shall not be discussing right at this very moment because I am lazy (and really, it's in wiki).
Some of the thoughts are obvious really, common sense. We all know that it's because of some cool people wearing high waist jeans or something that makes it spread. But what I found most interesting about the book was not really his theory, which I don't think is really on point all the time, but the examples given on successful products. Its just interesting reading about how stuff became popular. So yeah, I don't think the science or the theories are really all that, but I like the way its written and there are some interesting stories. GOod was to pass a few hours.