I have been obsessed with live data visualizations for the last couple of months, so here are some of my favorites.
An interesting live data visualization set dedicated to visualize the world in terms of population, economics, environment etc. and can be accessed at this site. This All People on a Page visualization (shown at the top of the page) is absolutely my favorite. It is impressive to see the sheer scale of every human being living on earth represented on a single web page.
I used to be an active member of this community and personally sent many llamas of approval to others in appreciation of their work. Here you can see the real time map of the comments, stars, llamas sent, and other community activity visualized.
The most recent one million tweets are visualized on this site (since apparently one million is the maximum number of tweets the Twitter API can provide at once). The coolest thing you can do with this visualization is that you can zoom in, click on the dots, and read every single tweet. You can also filter by hashtag.