The March Of Twitter: Analysis of How And Where Twitter Spread
Hubspot
AUGUST 26, 2010
The first public mention of the service I can find is on Evan William's blog late on July 13th , but you can see that even on the 12th there was a mini-boom in registrations. Evan's high-profile and Om's endorsement must have been a big help in building that sort of buzz. This is the day-by-day chart for the initial launch.
28 
Let's personalize your content