Unimplemented Feature: Invite Your Friends to Vox with a Stub Blog
I very rarely spam people with email, but in the case of starting this blog, I did, and a few joined Vox.
Unless they join (OpenId notwithstanding) I cannot express the relationship between us.
Since Vox seems prepared to handle millions of accounts, and indeed encourages non-Voxers to join in order to comment, I submit this:
Allow a Voxer to invite people by arranging a stub blog associated with their email. An "activation link" guarantees that the email recipient can activate it with a single click. Also can timeout if not acted upon. Also perhaps mention OpenId support and if it allows them to bypass usual "per service per login" horribleness.
This is only a little more pushy than the mass invite email, and since you don't misuse the invite feature, I think Voxers would use this to encourage friends to read their blog; by enticing them with their-eyes-only posts and friends-only media for example.
As email grows less desirable, blogs and feeds and networks and forums can supplant it.