According to an analysis of U.S. Securities and Exchange Commission data by the activist shareholder organization Open MIC, 68% of outside investors voted during the May 30 meeting for Facebook to separate the board chairman role from the C.E.O., up from 51% who voted on a similar proposal last year. An even more overwhelming majority, 83%, voted to implement a “one share, one vote” system at Facebook, replacing the dual-class structure that's now in place.