Apple CEO Tim Cook told MIT graduates “don’t be trolls, and, for God’s sake don’t become one.” (Photo credit: Jake Belcher)

In Cambridge on Friday, Apple CEO Tim Cook delivered the commencement address at the Massachusetts Institute of Technology, urging MIT graduates to serve something greater than themselves.

Cook has led the world's most valuable company since 2011, but early in his career he said he frequently asked “Is this all there is?”

“I sought guidance and religion. I read great philosophers and authors,” Cook recalled. “And in a moment of youthful indiscretion, I might even have experimented with a Windows PC. And obviously that didn’t work!”

Cook said technology - most of the time - is a force for good, but he warned of its downsides.

“The potential adverse consequences are spreading faster and cutting deeper than ever before,” Cook said. “Threats to our security. Threats to our privacy. Fake news. And social media that becomes antisocial.”

Cook also urged graduates to keep people and local communities at the center of whatever they do.

“I’m more concerned about people thinking like computers — without values or compassion, without concern for consequences,” Cook said.