Twitter Has 100 Million Monthly Active Users; 50% Log In Every Day

Twitter CEO Dick Costolo revealed some interesting stats about Twitter’s growth, including that it has more than 100 million active users and that signups via iOS device have tripled since the launch of iOS 5.

Twitter has been on a roll in recent months. The company surpassed 200 million tweets per day in June, but has since jumped to nearly 250 million daily tweets. The growth has been tremendous: Twitter had around 100 million tweets per day in January 2011.

Costolo revealed these stats during an interview at the Web 2.0 Summit in San Francisco.

Of those 100 million global active users, half of them log in daily. “We had 30% of our monthly active users loggin in every day at the beginning of the year. Now it’s over 50%,” Costolo revealed.

The company’s growth amounts to about 40% quarter on quarter. But perhaps the most interesting stat is the impact of iOS 5 on Twitter. Apple’s mobile OS directly integrates Twitter, and that has resulted in a boost for the company. Costolo revealed that Twitter signups via iOS 5 devices have tripled since the launch of that iOS update.