I think that not only do forums spread the word about fixed gears/peanut butter/ steak/ whatever it is you're into, they also VERY MUCH affect the styles of those things in the areas they touch.

I think the internet homogenizes culture a lot, which can be both good and bad. I think there is entirely too much fixation on what is cool (natural human behavior there, not much to be done about it). Conversely, I get lots of ideas from people elsewhere on new styles of things to try, like riser bars. The more people are forming their OWN opinions about things and sharing their knowledge, the better we all are for the existence of the internet. The more the "cool points" viewpoint holds out, the more people become like everyone else, and who really wants that?

Who gives a crap whether it's cool to ride with a brake or lights or no hands or no bartape on your track drops? Ride what you like, be safe, and for cryin' out loud, let's see pictures!!!