New YouTube Channels with Google+ Names
An increasing number of new YouTube channels are choosing to be represented by a Google+ profile instead of picking a traditional unique username (e.g. MysteryGuitarMan).
While YouTube usernames were always unique, Google+ profile names, which are based on users’ full names, are not.
In order to address this issue, we create a unique an external ID to represent each user. These external IDs are supported in the YouTube CMS wherever a YouTube username can be entered.
The external ID of a channel based on a Google+ profile can be determined from the URL of the channel. For example:
The external ID is the alphanumeric string prefixed with “UC”. In this example, the external ID would be “BiTuzlTyj....”.
Learn more about these changes at the YouTube Blog and in the Help Center.