Twitter’s departing chief Dick Costolo says that while he is confident in the current direction of the company, he also is willing to let the next CEO make the changes the person wants to make.

As Twitter chief executive officer Dick Costolo’s departure was cheered by stockholders, his fans struck a different note, flooding the micro-blogging site he has steered for nearly five years with messages of gratitude and support.

The chief executive of Twitter has quit the social network.