Facebook is clearly extra-serious about its efforts to beat internet sale sites at their own game through groups. As part of an update rolling out over the months ahead, the social network's For Sale Groups will let you tap a simple Sell button to hawk your wares -- from there, you'll just have to write a description and set basic details like the pick-up location and price. You'll also have an easy way to mark items as sold, or to sift through your history if you don't remember whether or not you sold that table lamp. Are these enough to make you ditch Craigslist? Not necessarily, but you'll at least have more reasons to stick with Facebook's For Sale Groups if you're an early user.