It's a big jump from clicks and pageviews to accurate, up-to-the-minute, personal location. It's one thing to know what you're browsing, and entirely another to know where you are.

The whole concept scares me. GPS would be great for aggregating location-based data, but feeding your lat/long to a remote location all day every day is not so appealing. Who knows who has access to that data and what their motives might be?