Many neurotypical children learn social skills as they go along, but children with autism do not have this ability. Most of the time, the hidden social curriculum of life must be spelled out to them.
Homeschooling is a 24/7 activity here at Sweet Schoolin'... as such we use every opportunity to teach. Never assume a child "gets it." Wait for evidence. Many will say you cannot teach a child social skills without the help of a professional, or a school district program. We here at Sweet Schoolin' kindly disagree.
Some good social skills resources:Social Stories by Carol Gray
Social Skills by Jed Baker
The RDI Book
My Turn, Your Turn
Social Thinking (Michelle Garcia Winners)
Gaining Face, face recognition software (free demo)
photo of children, oh that rachel, used under cc