I think my personal fear surrounding this is just paranoia, you know, "Big Brother Sees Us". Sometimes I google things just because I'm interested or quotes from books or movies or whatever, and then suddenly I panic that out of context it seems really inappropriate and before you know it I'll have Interpol on my door. Or that I would stumble upon child pornography, which I would also find so incredibly disturbing in addition to the fear that somehow it would be linked to me even though I never went looking for it.

So... Just some good old "government paranoia" here.