[adventured]

They'll attempt to find a mis-statement, a slip up of any kind that doesn't jive with any part of the rest of the picture / claim in question. They may look at the post for anything negative directed at a given person or the company, or slander generally (eg second line from end). Even if it's a stretch. From there it's a short hop to tossing around a few legal threats to end or substantially complicate the entire thing for most people on the other side.

[bradleyjg]

Can you point me to a few reported cases where this happened?

Lawyers have thier own urban legends, just like every other profession.