Social network for bike users Does a social network exists for bicycle users?

I'm working on a website that caters bikers who want to discover some parts of France, and I'd like to allow bikers to share their experience. I could use FB, but some other soc net are maybe more relevant.

What would a biker do?
Warmshowers is certainly not a "social" network in the meaning of socializing only on the internet. But it is an internet-organized network for socializing with other cyclists in the real world. Certainly a good fit to this question's tags touring and social. It's a great opportunity to meet really nice and interesting people - highly recommended!