Meta Platforms, TikTok and YouTube will face scrutiny in a trial in California Superior Court, Los Angeles County this week in what Reuters says is a test case for thousands of other lawsuits seeking damages for social media harms. The plaintiff is a 19-year-old woman from California, identified as K.G.M., who alleges the apps fueled her depression and suicidal thoughts and is seeking to hold the tech companies liable. The companies say a federal law that largely exempts platforms from legal liability for the material that users post shields them in this case. A verdict against the companies would put a crack in that defense, which has protected them from lawsuits for decades, Reuters notes.