A lovelorn and juvenile Mark Zuckerberg just wanted to get social cachet and lampoon his classmates when he made the first version of Facebook in 2003. Instead, he became an arbiter of free speech for more than 1 billion people.

His company has ended up ruling on whether users should be allowed to promote Thai juice-only diets, in Italian; if boosting the quasi-therapeutic use of the drug ketamine is OK; and when videos of communal violence in India should be removed.