Many people accumulate stuff but they can't throw it in the garbage. People who have children have this because they grow so fast. Then you end up with piles of clothes, toys etc. that are gently used. A website can help you sell or give it away.
HandMeDowns is a site where you can buy, sell or give away these items. It pulls in listings from around the internet and they have their own classified section, too. A great way to keep stuff out of the garbage.