Micro-blogging site 'Twitter' has reached yet another milestone, two billion tweets per month.
Twitter reached 15 billion tweets at the end of last month, three months after it broke the 10 billion count, 'The Daily Telegraph' reported.
Mr Costolo also said the service sees around 135,000 new registrations each day, though it is not clear how many of those are individuals rather than businesses.
The increasingly influential company announced on Monday that it is hiring a Washington liaison to manage relations with the White House.
Congratulations Twitter :)