I use google services whenever possible - it takes away the worry of wondering if there's something about me they don't know.
With Gmail for personal and business, Google Analytics, Android phone, Google Drive, Picasaweb photo sharing, GWT, Google Voice, Google Chat, Google Apps, Google calendar, Google Chrome, Google Maps (what am I leaving out?), I don't have to wonder whether or not Google knows about my sex life, financial status, personal and business connections, travel destinations, websites owned and visited, my loves and my lies. They just know and now I know they know.