The number of people going online has passed one billion for the first time, according to comScore, an online metrics company. Almost 180m internet users—over one in six of the world’s online population—live in China, more than any other country. Until a few months ago America had most web users, but with 163m people online, or over half of its total population, it has reached saturation point. More populous countries such as China, Brazil and India have many more potential users and will eventually overtake those western countries with already high penetration rates. ComScore counts only unique users above the age of 15 and excludes access in internet cafes and via mobile devices.