再转一个在中国是个传说的网站数据（这一个是Twitter，上一个是Facebook）：

Twitter history, milestones, user & Tweet statistics, top 10 countries, top 20 users (most followed).

Information collected from multiple sources in April 2010. Some data may not be up to date.

来源：http://www.website-monitoring.com/blog/2010/05/04/twitter-facts-and-figures-history-statistics/