This list comes from dixiesocial.com and has a list of yard sale/for sale groups in all 50 states (mostly just large ones) and all the groups combined over have 38 million members so it is a great way to market on Facebook for free. This is a great list if you are run running affiliate sites or ecommerce type sites. I use it to post "used" products that are similar to what my ecommerce site sells and then I link to my site and say "you can see the specs on it here". I post in about 40 groups a day and that generates about 400 to 600 visitors a day.