Since it first opened its doors to an unsuspecting public back in July 2006, Twitter has come a long, long way.

It took Twitter more than three years for the billionth tweet to be published on the network – now, that many tweets are submitted every 2-3 days by more than 140 million active users (growing at an astonishing million new accounts per day) across all age groups and demographics in nearly every major country around the world.

This infographic takes at some key Twitter facts and figures. Some of the metrics are a little out of date, and there are one or two design glitches, but this is a timely reminder of how fast and impressively Twitter has grown, and how important it has become, in such a short period of time.

(Source: Website-Monitoring.com.)