Seems all the social sites are taking a queue from virtual worlds and letting users buy and sell virtual goods (e.g., virtual clothes, furnishings, holiday stuff, even hair-dos). Now Ning.com, the site that lets users create their own social networks, is letting them create their own virtual gifts, "bringing a built-in virtual goods store to the site’s 1.6 million networks," TechCrunch reports. … [Read more...] about Ning adds virtual gifts