Jurors in a landmark social media case that seeks to hold companies responsible for harms to children got their first glimpse into what will be a lengthy trial characterized by dueling narratives from the plaintiffs and the two remaining defendants, Meta and YouTube. At the core of the Los Angeles case is a 20-year-old identified only by the initials "KGM," whose case could determine how thousands of other, similar lawsuits against social media companies will play out. She and two other plaintiffs have been selected for bellwether trials — essentially test cases for both sides to see how their arguments play out before a jury.

YouTube is changing its rules to protect its youngest users from potentially harmful firearm videos. The video sharing platform owned by Google says that starting later this month it will prohibit videos that demonstrate how to remove firearm safety devices. Videos showing homemade guns, automatic weapons and certain firearm accessories like silencers will be restricted to users 18 and older. Last year, researchers found YouTube was automatically recommending graphic videos of gun violence to young users, despite the platform's own rules which ban gory content. Critics say the new rules won't mean much if they're not effectively enforced by YouTube.

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The first phase of a massive development to house new YouTube offices in the Bayhill area is under construction, and city officials are now se…