By tracking and mapping defections within the Syrian leadership, it was reportedly designed to encourage more people to defect and 'give confidence' to the rebel opposition.
It was allegedly described as a “pretty cool idea” by senior Clinton adviser Jake Sullivan, and Google said it had enlisted the help of Al Jazeera to broadcast the tool in Syria.
"We believe this can have an important impact."
Thousands of Clinton's personal emails have been published and indexed by WikiLeaks, and some reveal interesting details about the relationship between the State Department and major corporations.
The email detailing Google's defection tracker purportedly came from Jared Cohen, a Clinton advisor until 2010 and now-President of Jigsaw, formerly known as Google Ideas, the company's New York-based policy think tank.
In a July 2012 email to members of Clinton's team, which the WikiLeaks release alleges was later forwarded to the Secretary of State herself, Cohen reportedly said: “My team is planning to launch a tool on Sunday that will publicly track and map the defections in Syria and which parts of the government they are coming from.”
Hillary Clinton in quotes
Hillary Clinton in quotes
1/10 Hillary Clinton
On running for President in 2016: 'I'm going to decide when it feels right for me to decide. ... certainly not before then [the end of 2014].'
2/10 Hillary Clinton
On the Monica Lewinsky affair: 'It’s liberating to be able to reach the point in your life where you feel you can forgive. Everybody feels they have been trespassed upon and nearly everybody has trespassed on somebody else, maybe not intentionally.'
3/10 Hillary Clinton
On news and hair: 'If I want to knock a story off the front page, I just change my hairstyle.'
4/10 Hillary Clinton
On being asked which fashion designers she preferred: 'Would you ever ask a man that question?'
5/10 Hillary Clinton
On equality: 'Well I'm very conscious of how important it is for us to shatter that glass ceiling in my country. A country that has done so much for so many women and really has set the standard for women's rights and responsibilities, and I do want to see that glass ceiling shattered.'
6/10 Hillary Clinton
On not winning in 2008: 'I think because I really didn't have a good strategy for my campaign. I didn't plan it the right way. ... As a candidate who was already so well known ... I don't think I ever said, 'Yes, you may have known me for eight years, but I don't take anything for granted. I have to earn your support.'
7/10 Hillary Clinton
On self-confidence 'You have to be true to yourself. You have to be enough in touch with who you are and what you want, how you want to live and what's important to you, to make your decisions based on that. Sometimes that's very difficult.'
8/10 Hillary Clinton
On 9/11: 'Every nation has to either be with us, or against us. Those who harbor terrorists, or who finance them, are going to pay a price.'
9/10 Hillary Clinton
On women around the world: 'If women are healthy and educated, their families will flourish. If women are free from violence, their families will flourish. If women have a chance to work and earn as full and equal partners in society, their families will flourish. And when families flourish, communities and nations will flourish.'
10/10 Hillary Clinton
On her political life: ‘I suppose I could have stayed home and baked cookies and had teas, but what I decided to do was to fulfill my profession which I entered before my husband was in public life.’
“Our logic behind this is that while many people are tracking the atrocities, nobody is visually representing and mapping the defections, which we believe are important in encouraging more to defect and giving confidence to the opposition.”
The email said Google would be “partnering with Al Jazeera” who would take “primary ownership” of the tool, maintaining it and publicising it in Syria.
Cohen asked the Clinton team to tell him if there was anything the company needed to think about before launching the tool, before adding: “We believe this can have an important impact.”
The visualisation was eventually published by Al Jazeera in English and Arabic, and Jigsaw's website claims it became one of the site's most-viewed visualisations.
A post about the tool on the site claims it successfully showed "patterns and trends" in support for the regime, but makes no mention of encouraging defectors or helping the opposition.
WikiLeaks has previously been responsible for publicising links between Google and high-ranking State Department officials, and founder Julian Assange's 2014 book When Google Met WikiLeaks accused the company of helping to further the US government's foreign policy agenda.
As the Daily Mail points out, the news comes as Google reveals its plans to expand internet access in Cuba, in an announcement timed to coincide with Barack Obama's historic visit to the island.
Clinton's thoughts on Google's plan were not revealed in the WikiLeaks release, but she reportedly instructed an aide to print out Cohen's email for later reference.
Google did not provide a comment.