Of course you know that if you use Google they track the websites you visit. And tailor ads accordingly. Now, Google has added another tracking "feature". Read about it here. In the article, if you click the link "New Features for Your Google Account", you may see your picture in the page that opens up (I did). Google then explains what they're doing. One 'nice' feature of this is that one has to opt in, instead of opting out.
So, read on and decide what you will do.