Communication is mainly based upon groups. Management can create groups (classes, committees, etc.) or even teachers or parents can create groups around a particular topic and take advantage of a collaborative group discussion area, group files and group pages. You can create open groups that anyone can join, and closed groups, where membership is requested first and accepted or denied by the group owner.

Access
The community site has always had powerful, granular, access controls for users. Users can restrict their content to be only read by people they mark as a friend from any tool in the site. We've also introduced a a user-defined default setting (providing administrators allow users to set one) that will apply to all their content.

So you can share anything with whomever you want. This makes it perfect suitable for an Intranet.