Market research firm Synovate has some new insights into Chinese netizens usage of the web – how it differs between poorer and richer cities, that more people than ever in China go online on their mobiles, how e-commerce has exploded even in less prosperous cities, and that the internet has (for the first time) surpassed television in terms of engagement levels. It’s a part of Synovate’s Media Atlas China study, which surveyed 66,000 consumers across 88 ‘tier one’ to ‘tier five’ cities and rural areas across mainland China. Before we get to the meat on the bones, we have to gnaw at the gristle of what exactly constitutes these levels of cities. So here’s a quick primer on China’s cities: