Google's new Activity Tool lets you view, edit and delete all the information Google has collected about you.

If you have a Google account (if you use Gmail, Google Docs, Calendar, etc. then you have an account) you can now manage all the information Google has collected about you - websites you've visited, things you've searched for, YouTube videos you've watched, and so on. The My Activity tool shows you exactly what Google knows about you while giving you tools to review, edit and delete any data that Google has collected about you when you use Google services such as Google Search, YouTube, Android, etc.