Social networking site Twitter has more than 105 million users, a figure which is growing at a rate of 300,000 per day.
And at the site's current rate in growth, it is on pace to double in size this year.
The site serves 180 million unique visitors to Twitter.com per month, co-founders Evan Williams and Biz Stone said at developer conference Chirp. A majority of users – 60% - come from outside the US.
Twitter has a powerful developer ecosystem, FT.com said, with 75% of traffic served by external Twitter clients. The site has 100,000 registered Twitter apps, and receives 3 billion API calls per day, according to GigaOM.
The site also serves 19 billion searches per month – more than Yahoo and Bing combined, and second only to search giant Google.
The site has 175 employees.
Twitter this week unveiled its long-awaited search advertising platform, Promoted Tweets, as a way of finally making money from this rapid growth.