I can't answer that yet, but I don't think that's a good enough reason to ignore it. We are talking about the world's leading search company. There's no such thing as security through obscurity for them - they find needles in haystacks for a living.

We're also talking long term - none of this stuff is going to be deleted, it's only ever going to grow in their collective. What if you do become someone famous or important in twenty years?

Safe from misuse by Google? I think that's a risk you take with any third party provider

But it's more of a risk from Google for several reasons - 1) they have so much of it, and 2) they're so good at searching and correlating, and 3) they're so big their data is a major drooling point for .gov legislation or hacker interests.

Chances are most of us are just not special enough to be legitimate targets.

Agreed. But if anyone can automate something they-think-is-benign-but-I-disagree on everyone's data all at once, Google can.