A cloud-based platform for networking, blogs and projects. Some of the technologies we're considering: MongoDB, JSON, OpenSocial, Scala, AJax, Glizzard, Nuxeo, Lift support for RESTful services, Gadget Server / part of the Shindig project, RabbitMQ, Hadoop / map reduce
We are also interested in video conferencing.
Experience with semantic web / natural language processing a big plus