two members on Mumsnet are in serious trouble
They're certainly in line for having to pay out a lot of money if he sues them for libel. But the news story was just about the complainant going to court to get an order for Mumsnet to reveal the posters' identities. I know this happens because I was threatened with the process on Mumsnet a couple of months ago. (nothing to get excited about, ladies. I hadn't libelled anyone. I just now know what the procedure is)
What I didn't know, and what shocks me somewhat, is that Mumsnet were required by the court to hand over the posters' private messages. So, be careful; your 'private' messages aren't