Google new privacy rules, which are set to take effect Thursday, have drawn scrutiny from privacy advocates and state officials. Jens Meyer/AP hide caption

itoggle caption Jens Meyer/AP

A sign for Google is displayed behind the Google android robot, at the National Retail Federation in New York. Google is planning to roll out a new privacy policy Thursday. Mark Lennihan/AP hide caption

itoggle caption Mark Lennihan/AP

YouTube's history and search history are separate tabs that users may want to use to clear their past usage, as seen in this screen grab. NPR hide caption

itoggle caption NPR

A visit to the Pinterest home page reveals images of what some say are stereotypically female interests, from women's fashions to recipes. Pinterest hide caption

itoggle caption Pinterest

Kay Clymer spends hours each day urging fellow Christians to vote. She finds their phone numbers through a database created by the company United In Purpose. Steve Brown/WOSU hide caption

itoggle caption Steve Brown/WOSU