Twitter marks birthday with top tweets

Social media giant Twitter celebrates its ninth birthday today, and to mark the occasion the site has been recalling some of the biggest posts from its history.

The very first tweet came from co-founder Jack Dorsey, back when the service did not use vowels in its official name — “Just setting up my twttr”, he wrote on March 21, 2006.

Since then, the site has amassed 288m monthly active users while 500m tweets are sent per day.