Pearltrees is a social bookmarking tool that allows people to organize links and information visually into a web of interconnected nodes.
Here's how their site describes it: Pearltrees is a collaborative network that let users create, enrich and share the world of their interests. We call it a human-powered interest network because its content is made and organized by its community. In Pearltrees, everyone creates its world and uses parts of others' worlds to extend it. By doing so, everyone contributes to the overall project: building the first human organization of the Web.
Global Map of Social Media - December 2009 - This graphic shows the geographic breakdown of different social web technologies (photo, video, social network, blog, microblog) and the extent to which they are used among those with internet access. The research from TrendStream is based on interviews with 32,000 Internet users in 16 countries.
"Each block contains up to eight pieces of information. The rank (and sequential order of the chart), place among the top ten fastest growing internet populations, the country code (also the countries ccTLD), rank among the countries with the fastest bandwidth speeds, percentage of population using the internet, the country name, and in some cases whether or not the block represents a country or territory."
This is from a really thoughtful post on 'China and the World Map of the Internet', which includes several iterations of visual representations of how China relates to the world. The version above is the cloud map view of the relative proportion of languages used on the internet.