Welcome to Law.com Class Actions: Critical Mass, a weekly briefing for class action and mass tort attorneys.

This week: Lawyers for bankrupt subsidiaries of Johnson & Johnson and 3M were both in court this week facing dismissals of their Chapter 11 cases. A federal judge sanctioned Facebook and Gibson Dunn for making "ridiculous," "frivolous" and "laughable" arguments to avoid discovery. Find out who got appointed to lead lawsuits against Kia and Hyundai over car thefts.

I'm Amanda Bronstad. Feel free to reach out to me with your input. My email is [email protected], or follow me on Twitter: @abronstadlaw.