March 26 (UPI) -- A California jury has found Meta and YouTube liable for negligently designing addictive social media platforms that harm children, in a landmark verdict that could have lasting implications for the tech industry.

The Wednesday verdict marks the first time technology companies have been found liable for creating addictive online products, amid increased scrutiny of the industry and a wave of litigation.

"This jury saw exactly what we presented from the very first day of trial: that these companies built digital spaces designed to negatively influence the brains of children, and they did it on purpose," Mark Lanier, lead trial counsel and founder of The Lanier Law Firm, said in a statement.

"The evidence showed that Meta and YouTube knew their platforms were hooking children and harming their mental health, and instead of fixing the problem they kept developing features to maximize the time kids spent on their apps. Now a jury has told them that is not acceptable, and you are being held accountable."

UPI has contacted Meta and YouTube for comment.