Meet Wonder! As social networking sites go, it's pretty darn nerdy. Cosplay, figurines, mecha, anime drawings—you name it, Wonder! seems to have it.
Just launched by Yahoo! Japan, the site does have a decidedly otaku (geek) focus and an unnecessary exclamation point. Wonder! is image heavy, which I personally prefer for social networking sites (and is probably why I enjoy Instagram).
As IT Media points out, Wonder! is similar to Facebook and Twitter: you can upload images, "like" other people's uploads, and follow them.
If you want to become a member, you'll need either a Yahoo! Japan ID, a Facebook ID, or a Twitter ID (fyi: an iPhone app is planned by year's end). Currently, the site only seems to be in Japanese, but that has never previously stopped those who don't know the language.
The site does have a never-ending page, which does seem to cause load time to crawl the further you go. And once you click on something, it takes you back to the top of the page. That's annoying! (necessary exclamation point)
Here's a sample of what you can find (warning: skimpy cosplay outfits):
Most of the content varies between mecha or hero figurines (or models) and female cosplayers. Over time, expect it to become more varied and slightly more inclusive. If you are into Japanese subculture stuff, Wonder! is worth checking out.