The social network sent press invitations to a March 7 event at the company's offices in Menlo Park, Calif. "Come see a new look for News Feed," the invite reads.Related StoriesGartner: Public cloud market to grow 18.5% tis yearThree year wait for Apple's iWatch?5-year-old's £1,700 in-app purchase bill, Apple backs gay marriage, Chromebook ads copy Apple's, urine analysis app