Check this out. Kathleen Seidel who uses her blog, at http://neurodiversity.com to support rights for folks on the autism spectrum and bad mouth crackpots who say wacky things (including things like, "autism is caused by vaccination). One particular set of crackpots who are suing a pharmaceutical company or the government or whatever, are trying to subpoena everything in her life vaguely associated with her broad rambling blog. She's not involved in the case in any way, and this is just an attempt to intimidate a vocal critic.
If the judge allows the subpoena, then no one will be able to blog freely on any subject. We will all be afraid that everything from our tax returns to our church attendance will be on trial if someone launches a civil action that has some connection to the topic we are discussing.
This story has also been picked up by Overlawyered.com. I do so hope that the judge is as offended as he should be and that there is some sort of sanction for this outlandish behavior.