Traditionally cagey Twitter yesterday released a mountain of statistics at Chirp, the company’s developer conference, about its business.

According to Twitter CEO Evan Williams, the company has compiled a user base of just under 106 million since its 2008 launch and is adding 300,000 new users per day.

Williams noted the importance of mobile apps, showing that 75 percent of Twitter’s traffic comes from outside of Twitter, which means tweets that originate from a third-party app that posts to the site. Twitter says it gets 3 billion requests per day and Twitter users are spouting off 55 million tweets per day.

It is perhaps surprising that a company that’s putting up those kinds of numbers recently reported employing just 175 people.

Earlier this week, Twitter announced it is launching the first phase of its Promoted Tweets platform with a handful of advertising partners, including Best Buy, Bravo, Red Bull, Sony Pictures, Starbucks and Virgin America.