Egyptians use their mobile phones to record celebrations in Cairo's Tahrir Square, the epicenter of the popular revolt that drove Hosni Mubarak from power in 2011. Twitter was often used to record happenings during the Arab Spring.
Mohammed Abed/AFP/Getty Images
Best Actress nominee Quvenzhané Wallis is interviewed on the red carpet at the Academy Awards Sunday, when several journalists struggled with the young actress's name.
Joe Klamar/AFP/Getty Images
Investors and financial analysis firms are increasingly looking at "sentimental analysis" — such as Facebook "likes" and Twitter messages — to gauge a company's social popularity.