USG surveillance contractor and social engineering organ Google has banned politcal discussion among employees just as the firm is throwing its support behind an apparent USG backed "color revolution" in Hong Kong (archived, archived). The substantial language and cultural differences between the Mandarin speaking mainland and Cantonese speaking former British rent-a-port have been a reliable source of tensions between the two while the structural barriers between the Chinese languages and European languages make any publication claiming to outline the substance of the disputes fueling Hong Kong's present unrest for you suspect.
Then again, if one looks at the trends and compares the incredible development the mainland is experiencing versus the relative stagnation of Hong Kong's modern democracy with the "One Country, Two Systems" experiment, one could suspect some jealousy or resentment are at play.