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By Alexei Oreskovic SAN FRANCISCO (Reuters) - Facebook Inc Chief Executive Mark Zuckerberg blasted the U.S. government's electronic surveillance practices on Thursday, saying he'd personally called President Barack Obama to voice his displeasure. "When our engineers work tirelessly to improve security, we imagine we're protecting you against criminals, not our own government," Zuckerberg said in a post on his personal Facebook page. "I've called President Obama to express my frustration over the damage the government is creating for all of our future. Unfortunately, it seems like it will take a very long time for true full reform," the 29-year-old Zuckerberg continued.