Yesterday a story broke that Google fired an employee for using his position within the company to gain access to private information.
 tapped into call logs from Google Voice  accessed contact lists and chat transcripts  unblocked himself from a Gtalk buddy list 
The fired employee, David Barksdale (27), was a Site Reliability Engineer. SREs have almost complete access to Googles most sensitive user data as they have to be able to troubleshoot problems with the core software that stores this personal information and functions with it.
SREs can access this information on-site or from remote locations. Apart from standard machine logging of when what was accessed for how long, ex-SREs say there is little or no oversight to ensure access is on a need-to-work basis instead of a want-to-know.
Google Knows ALL Of You
What jumped out at my from the Gawker story though is confirmation of something we all suspected:
 with a friend's consent, he pulled up the person's email account, contact list, chat transcripts, Google Voice call logs"even a list of other Gmail addresses that the friend had registered but didn't think were linked to their main account"within seconds.
* my emphasis
To me this is a huge one, a chunk of information you normally dont get that easily.
In subsequent years we learned that most anonymous information can be de-anonymised.
But this is the first time we have confirmation that, yes, Google can combine information from its various databases in such a way that they know your main account, your fake accounts, your aliases, your
And if you think using Incognito Mode on your browser helps " think again.