
Originally Posted by
lesterj
Thanks everyone.
It makes sense that GWT wouldn't be very useful to Google in detecting spammy links since the data is coming from them in the first place. But Google Analytics would give them access to traffic data from the site and other data which could be useful.
GA would also allow Google to definitively determine if you own several different sites. In other words, if you own 10 sites and those sites have some links to each other and you are tracking all the sites under one GA account, they would be able to see that the sites are all connected (though there may be other ways to determine that). For people who use "buffer" sites for sketchy link building, but track the website analytics for both sites under one GA account, if Google looked at GA data, then they could see that the sites are connected and connect the sketchy link building tactics back to the main site. Similarly, if you claimed both the buffer site and the main site in GWT, that would tell Google they are connected.
Clearly Cutts is saying they don't us GA data, but I could see how it could be helpful to them if they wanted to. Then again, Matt's response was in April 2011, before they combined all privacy policies and opened up data sharing between products. Maybe things have changed.