Homeschooling Facebook resources

When you homeschool and want to find homeschool resources such as used curriculum
or groups to connect with, you can search for homeschool groups in your area. Sometimes the groups are private and you have to ask for permission to join.  In the past, joined several groups so that I could purchase used materials (ie a math curriculum from a homeschool mom who was finished with  it) and sell my unused materials to others.