The first tweet was posted by co-founder Jack Dorsey on March 21 , 2006 . The site now averages 140 million tweets a day . Twitter now has nearly 200 million users posting 140 million tweets a day . Comment:
The first tweet was posted by co-founder Jack Dorsey on March 21 , 2006 . Twitter now has nearly 200 million users posting 140 million tweets a day . Comment: