Google+ With 60M+ Users And Growing… But Active User Count Still Unknown(techcrunch.com)
techcrunch.com
Google+ With 60M+ Users And Growing… But Active User Count Still Unknown
http://techcrunch.com/2011/12/27/googleplus/
http://techcrunch.com/2011/12/27/googleplus/
A separate issue is how to accurately track "active users" given that G+ is getting so tightly integrated with almost all popular Google services.