A few websites that may be good points of reference

 The Vintage List :"The idea for The Vintage List came to me when I realized that the way vintage is being bought and sold online is changing - in the Web 2.0 world, buyers and sellers can no longer rely on just one shopping venue! Vintage shops are popping up all over the web, on various venues and on individual websites. I saw a real need for a way to bring all of these shops together, and The Vintage List was born!"

Fashion Dig (Vintage Clothing): "Fashion Diggers love to talk about all things vintage, especially their fabulous finds. After all, it's not just the clothes...it's the story behind the clothes that count. Share your knowledge, or dilemmas, about vintage fashion and style with other like minded people here."

Swap Vintage: Swap Vintage is a unique online community set up specifically for members to be able to swap vintage items with one another - while it has a lot of the features of a regular social network, the main focus is to facilitate swapping"

A news article on how online vintage fashion retailer ModCloth utilizes the participatory and user-generated aspects of Web 2.0 / crowd-sourcing: "ModCloth takes its customers' fashion advice to improve its buying decisions, but it's also about building community. Customers leave comments on clothing samples and vote, but can also share their views with friends via Facebook or Twitter. It results in a group of people who may not know each other, but share in common an interest in fashion and a desire to talk about it. These fashionistas are a part of a community more complex than garments, though. ModCloth's blog, ModLife, covers everything from fashion to recipes, and provides "cool links" on the Web. There's even a link to a Flickr account where customers upload photos of their favorite ModCloth outfits...Online shops generally have a narrow frame of thought, assuming their customers came to them for only their products. But Web 2.0 is about community, and ModCloth was right in assuming that its shoppers have more in common than clothing."

Online vintage fashion communities in which geographically dispersed users upload photos of themselves in their day-to-day outfits, many focused on or incorporating vintage:

Chicismo: "a global community of girls sharing their personal style and inspiring others."

LOOKBOOK.nu: "The Internet's largest source of fashion inspiration from real people around the world" and "collective fashion consciousness." Typing 'vintage' into the search box on the homepage brings up 5265 look matches and 99 different users.

Blogs: 

Trish Hunter Finds - A girl in Victoria who has an extensive vintage collection from clothes to books to kitsch porcelain figurines. Also an online store. Has 163 followers to date and media coverage including front page of Heidelberg & Diamond Valley Weekly, Melbourne Weekly Eastern and Emerald Hill Weekly.