A virtual nomadic identity can include channels on other services and protocols. There are a number of uses when it comes to identity management. We currently base identity on possession of your private key; and most/all other services base it on your server login. I need to completely remove the actual identity from *anything* that could change. You can change your key now, but it's clumsy and involves updates to a lot of tables all over the network. With a virtual identity you just attach a new key to your identity and you're done. We don't have to fix data in 20-30 tables. As a side effect you could also link your identity to a Mastodon account (for instance) and sync posts/comments from there with your Hubzilla channel.