Twitter whistleblower says security holes cause ‘real harm to real people’

A Twitter whistleblower on Tuesday testified before Congress that the company’s failure to secure sensitive data causes “real harm to real people,” prompting senators to grapple with Washington’s inability to effectively regulate major social networks.

Peiter “Mudge” Zatko’s Senate testimony — which expanded on an 84-page complaint shared with regulators and The Washington Post this summer — said that Twitter executives misled the public, regulators and the company’s own board about its systemically broken defenses against hackers.