The best way to manage security issues in open source systems is to be open and aggressive in hardening the systems instead of pretending there won't be any issues. Open source systems can become relatively more secure with time due to their transparency and ability to surface issues quicker.
The speaker discusses the security issues with both centralized and decentralized systems, highlighting the advantages of open source systems and retaining control over sensitive data from large companies.
The security challenges of social media include increasingly sophisticated adversaries and algorithms that maximize attention and engagement by increasing division and anger among users, particularly when it comes to hate speech and foreign interference in elections.
The incentives of a company that focuses on the long-term is to provide people with valuable content over time, not to generate attention today. The misconception is that the company is built only to make more money or to get people to spend the most time on it in the next quarter or year, which is not the case.