Sentence:  The dirty secret of the internet is that all this distraction and interruption is immensely profitable. Web companies like to boast about [...], or offering services that let you... "share the things you love with the world" 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 <WSD>own</WSD> attention. 
Meaning of the word marked with <WSD> tags:  Belonging to; possessed; proper to. Often marks a possessive determiner as reflexive, referring back to the subject of the clause or sentence.