Sentence:  Now we are liberal with our innermost <WSD>secrets</WSD>, spraying them into the public ether with a generosity our forebears could not have imagined. Where we once sent love letters in a sealed envelope, or stuck photographs of our children in a family album, now such private material is despatched to servers and clouds operated by people we don't know and will never meet. 
Meaning of the word marked with <WSD> tags:  A piece of knowledge that is hidden and intended to be kept hidden. (from late 14th c.)