Mapping Twitter's heartbeat | MAPPING a visual overview | EDTECH ~ ICT | Thinking, Tips & Tools - the Internet Tracks & Trails  -Besides... QUESTIONING them all ! | Scoop.it

"In just under seven years, Twitter has grown to count nearly 3% of the entire global population among its active users who have sent more than 170 billion 140–character messages. Today the service plays such a significant role in American culture that the Library of Congress has assembled a permanent archive of the site back to its first tweet, updated daily. [...] Geographic proximity is found to play a minimal role both in who users communicate with and what they communicate about, providing evidence that social media is shifting the communicative landscape."