Seventy percent of U.S. teens hide their online behavior from their parents, according to a study done by security tech firm McAfee, up from 45% in '10. The Intel (INTC)-owned unit said that 43% of teens have accessed simulated violence and 32% have accessed nude content or pornography online.
Yahoo Inc will buy blogging service Tumblr for $1.1 billion cash, giving the Internet pioneer a much-needed social …