If your looking to make math and literacy connections online I recommend you check out Wiziq's virtual classroom. It has a free basic feature with a bunch of features.
Welcome to the community for those using Ning to power their educational social network. Also be sure to check out Classroom 2.0 for general discussions of Web 2.0 in the classroom.
Please introduce yourself in the "Introductions" forum post. And to see a list of Ning networks being used in education (or to add yourself!), please visit Social Networks in Education.