Feature request: Allow each Person to have multiple distinct usernames

[Joshfindit]

Two initial use-cases:

1. Welcome people's desire to publicly compartmentalize. For example; showing one image to family, one to friends, or one for business, one for personal, or multiple different businesses each with different branding

2. The ability to Ingest personal or personally traumatic experiences and work with them separately without running across reminders on a 'feed' or through casual exploration