Source - Data column on the Users Data report

The Source column on the Users Data report represents "Where" a user was registered or created from. 

A self registration URL might look something like this:

http://www.brainshark.com/mswisher/register/1?581128

The template ID would appear in the source column of the Users Data report as 581128

Other values may appear and are noted below:

0 = is a manually created user from Admin

1 = is user created through the self reg. process

101 = is a user created through webservices, most likely through API (Salesforce CRM Connector, etc.)

102 = is from bulk upload process

105 = is specifically from SSO auto-create function

106 = User was auto created (Salesforce user sync, auto-create through Highspot, Salesforce, etc.)