Musing about Facebook’s first 15 years, CEO Mark Zuckerberg positioned it as a David confronting a Goliath composed of hierarchical institutions. Facebook gives the masses a voice, he wrote. It brings communities together and provides businesses with low-cost outreach. Progress has been made in addressing the new social and ethical issues raised, including protection of privacy, according to Zuckerberg. The amount Facebook will spend on safety and security this year will surpass its entire revenue at the time of its May 2012 IPO, he noted.