Social Networks for Moms

Moms obviously serve a very important role in the home, including influencing or being responsible for most of the important purchasing decisions in the home. I have yet to see any good social networks dedicated to supporting mothers at home. There are numerous vibrant forums all over the Internet but there don't seem to be any good actual social networks out there.

Has anyone come across any social networks for moms? Or alternatively what kind of features would a mom want in a social networking site just for moms?