Twitter ceo Dick Costolo at the NYSE to launch the Twitter IPO.
Adam Jeffery | CNBC

Twitter CEO Dick Costolo received thousands of questions from Twitter's 271 million monthly active users this week. In a CNBC exclusive, our Julia Boorstin sat down with Costolo to ask some of those questions ranging from user growth to privacy concerns.

The hashtag #AskCostolo took on a life of its own, trending in the United States, primarily because of questions related to user safety and privacy. 32% of tweets posted were related to user safety, privacy and abuse, according to TweetBinder, a social analytics firm.