An interesting infographic from Mikogo Online Meetings showing the evolution of communication from our earliest days, when people relied on courier services, pigeons and even drums for communication.

In 1940, only 3 people could make calls simultaneously in any one city. Today over 34,000 phone calls are made in the US every second,  over 300 million tweets are made daily, over 100 trillion emails are sent every year and in 2011, 8 trillion text messages were sent.

Click the thumbnail for the full picture.