Combine social networking and classifieds and online buying and selling really start to make sense. Why? Because you can get a much better feel for who you're dealing with. You can peruse the profile of the person who responded to your ad. Even better, you can go to your network of friends and acquaintances first when you're ready to unload that laptop or car, no screening required. And you can donate the proceeds to a charity of your choice in a few clicks. I'm mentioning all this because Oodle, which started providing online classifieds to MySpace last summer, today launches Facebook Marketplace (disclosure: Oodle is a sponsor of NetFamilyNews, but even if it weren't I'd tell you that selling stuff to the wider circle of friends and acquaintances that social networking allows makes sense and is safer than other forms of classifieds online and offline). Where charitable selling on Facebook is concerned, members "can go to Marketplace, post a listing and select ‘Sell for a Cause.’ Once posted, the listing will be distributed to their friends through news feeds allowing the seller to tap their social network for fundraising." This classified advertising's free. Here's the San Jose Mercury News's coverage, and here's Oodle's own Safety & Fraud Center.