About 70,000 people attended the summit in Lisbon, Portugal, with a lot on their minds. The tech industry is facing more challenges than ever before — from regulation and hacking, to questions about funding and the trade war between the world's two biggest economies.
Vera Jourova, the European Union's top official for justice, consumers and gender equality, said that after years of clashes with European regulators, Big Tech now seems more willing to work with the authorities.
"I think they started to understand the law must be applied online and that they don't operate in vacuum," she told CNN Business in an interview.
But while there may be a growing realization that more regulation in Europe is inevitable, some believe that officials elsewhere, especially in the United States, need to challenge the idea that the internet cannot be regulated.
"When you go to a doctor, do you feel safe? When you sit on an airplane, do you feel safe? Yes, you do. Because of regulation," said Christopher Wylie, the whistleblower in the Cambridge Analytica scandal, during a panel debate at the conference.
"If we can regulate nuclear power, why can't we regulate some code?" he added. Wylie's revelations about his former company's use of Facebook data sparked global outrage about privacy.
The scandal sparked global outrage and fueled growing concern among internet users about the privacy of their data. Consumers are beginning to challenge the idea that companies should be able to use their data as they like in exchange for providing free services.
That leaves Big Tech to figure out how to strike the right balance between privacy and security.
"We could require two factor authentication and biometric identification every time you read an email," said Tamar Yehoshua, Google's vice president for product management. "This would make accounts virtually impervious to hackers, but it would also make technology more cumbersome to use."
Jourova said the idea that tech companies are just "pipes" for other people's content is dying.
"From the majority of the [top] people from the big companies, I hear 'we are responsible, we see that something wrong is happening, we are part of the problems, so we recognize that we must be part of the solution,'" she said.
But even if they understand they have the responsibility to act, many companies are struggling to find the answers.
"We absolutely need to curb the radicalized behavior, I think any reasonable person agrees that is not healthy," Alexis Ohanian, the co-founder of Reddit, told CNN Business in an interview. "The question is how we actually enforce that to scale, and I think that's the challenge every platform is struggling with right now."
One of those who walked out was Jacquelline Fuller, the president of the company's charitable arm. In a speech at the conference, she said Google needed to do a "better job at creating a safe and inclusive workplace."
The MeToo campaign, and calls for equal pay and a more inclusive tech sector, were also high on the agenda. Lisa Jackson, Apple's vice president for environment, highlighted the need for more access to education for girls.
"We can't find the answers we need without women involved," she said.
The funding that fuels the innovation in the tech industry poses yet another challenge.
But the uproar over the murder of journalist Jamal Khashoggi at the Saudi consulate in Istanbul last month means the recipients of Saudi cash now face some uncomfortable questions.
Twitch CEO Emmett Shear said startups must recognize that accepting money from certain investors has consequences.
"It's not just accepting a check," Shear told CNN Business in an interview. "You're going to be in business with these people, and you should think hard about that."
Michael Kaplan, Samuel Burke and Hadas Gold contributed reporting.