"If Ann wanted to sue people who falsely reported her blog as a spam-blog, could she make Google cough up their information?"

"I think the answer is yes."

Says lawprof Glenn Reynolds, contemplating the possibility that Google removed my blog because, as a longtime reader/former Google employee wrote:

Blogger lets users report spam blogs here...

so one possibility is that people who don’t like Ann’s blog launched an astroturf campaign to get her marked as spam.