As Amir Efrati says – There’s No Avoiding Google+ (Online WSJ, Jan 2). If you create any kind of Google account (GMail, YouTube, even Zagat restaurant reviews.), you get (are forced to have) a Google+ public page.
Here’s the reason:
Because using Google+ requires people to sign in to their Google accounts, Google will be able to blend mounds of data about individual users’ search habits and the websites they visit with their activities on Google+. That is a potential boon to Google’s ad business, from which the company derives about 95% of its more than $40 billion in annual revenue, excluding its new Motorola phone-making unit.
The more you say about yourself, and share, and click on a +1 button, the better Google can target ads. Of course, Facebook does the same.