Sentence:  The dirty secret of the internet is that all this distraction and interruption is immensely profitable. Web companies like to boast about "creating compelling <WSD>content</WSD>", or...and so on. But the real way to build a successful online business is to be better than your rivals at undermining people's control of their own attention. 
Meaning of the word marked with <WSD> tags:  that which is contained