I just joined a Ning. http://bookmarketing.ning.com/profile/MaryJNickum
A Ning is a social platform for an interest or passion online. Every member can reach millions of people from across the world to explore and express a particular interest, discover new outlets, and meet new people with shared pursuits.
I'm bringing the existence of a book marketing Ning to everyone's attention. Whether or not you choose to join, is your decision. I provided the link so you can check it out if you want.
As the author of a children's chapter book, I think any help with marketing is a plus. I think other authors may feel the same way.