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 manually created user from Admin

1 = is uses created thru the self reg process

101 = is a user created thru webservices.. most likely thru API, or Salesforce integration, etc

102 = is from bulkupload processing

105 = is specifically from SSO auto-create function

106 = User was auto created