Trendy juniors unite! WGSN reports that mega-retailer Wet Seal has launched an online community.  Customers can now shop online, as well as create and design their own pieces, using Web 2.0 technology. It also allows girls to build, tag, share and purchase outfits through a personalized boutique, build a fashion network by chatting with other stylists in the message center, and rate and purchase other stylists' outfits in The Runway.