Semi Private Content
At the moment ( we have the same problem in Sharepoint, we either can share anonymously on a per file basis, or with users that have identified live Accounts. the New Security of Live Accounts (or O365 Accounts) doesn't allow to create one live account or office 365 and share it with a group of people (if they are in different countries the account requests confirmations or is blocked). this would be great for example if we have videos of a congress and want all members to view them but not having to identify each person individually. We have the same requests for photos.