A server maintains a multi-user gallery of ephemeral messages. Ephemeral messages are posted to the gallery by multiple different users for online viewing via a single, common gallery. In response to a gallery view request from any recipient device, the ephemeral messages in the multi-user are displayed on the requesting device in automated sequence, each message being displayed for a respective display duration before display of the next message in the gallery. Each ephemeral message is removed from the gallery, thus being unavailable, for viewing upon request, at expiry of a respective corresponding message availability parameter. An account administration interface is provided to enable multiple users to post to the multi-user gallery as a single organizational or celebrity account.