Are you worried about the privacy of your location history leaking from your mobile / cell phone or wifi usage. Does it bother you that Google can track where you are and when you were there? Do you want to know what Google has stored about you?
A lesser known feature of Google’s know-everything-about-you is the location history tool. Not only can you filter by date ranges, but it also tracks your total distance traveled.
My location history is switched off. I find it rather intrusive. I also have the feature switched off on my Google Nexus 4, even though it degrades the Google Now feature quite significantly. The NSA ruined this kind of innovative feature if you ask me.
Photo credit: these birds are watching by José Pedro Costa