The difficult part is always key management: making a service that my mom can understand and manage and "just works". Our federation layer is built on XMPP. Tha

The difficult part is always key management: making a service that my mom can understand and manage and "just works". Our federation layer is built on XMPP. That gives us a pretty solid layer to extend chat and interoperate with gtalk and other chat services including video via Jingle.