Because the string is invalid or your source is not attached to your search engine.
This is a good question, and I've wondered about that myself. I'm going to 'report' the question, not because there's anything wrong with it, but to bring it to the attention of the Moderators, so they can tell both of us.
Answer:
E) all of the above
Explanation:
Your device can track your location, which means that it will tell where you've been. When you post on social media or just online, you are sharing what you're thinking. Your friends and family can easily be traced back to you, so they know who your friends and family are, and we leave evidence of what we've done because whatever you click gets tracked. hope this helps :)
