The Web passed the 1 billion user mark last month, according to comScore. That's a billion Web site visitors aged 15+, using home and work computers, in the months of December. So - given the rapid rise in Web browsing and social networking via mobile phones (especially in Europe and Asia) - the number could well be higher. ComScore says "the Asia-Pacific region accounted for the highest share of global Internet users at 41%, followed by Europe (28% percent), North America (18%), Latin-America (7%), and the Middle East & Africa (5%). Here's CNET's coverage, as well as an earlier post on MySpace and Facebook numbers.