I'll put this in the "It's on the internet so it's true" category, but assuming it IS true.... wow:
pressure cookers, backpacks and quinoa, oh my!:
"It was a confluence of magnificent proportions that led six agents from the joint terrorism task force to knock on my door Wednesday morning. Little did we know our seemingly innocent, if curious to a fault, Googling of certain things was creating a perfect storm of terrorism profiling. Because somewhere out there, someone was watching. Someone whose job it is to piece together the things people do on the internet raised the red flag when they saw our search history."
[Update a few hours later] Unsurprisingly there's more to the story: Updates At The Atlantic Wire.
[And a few hours later another update] Employer Tipped Off Police To Pressure Cooker And Backpack Searches, Not Google