Taken in isolation this could sound scary, but as zalew says here[1] it's needed for them to operate. Seriously, think about what would happen if google suddenly started publishing your (private) content. They'd lose all trust from the wider population. For them to publish or publicly display your content in a way that would violate your privacy would be an absolutely stupid move. Google hasn't gotten to where they are now by being absolutely stupid. [1]http://news.ycombinator.com/item?id=3582421