Investors Unnerved: Is Twitter Too Difficult to Use? 

If yesterday wasn’t all that great for Twitter, today is starting off even worse. The social media company’s share price has fallen some 20 percent in pre-market trading, to $51.49.

The possible culprit? Twitter’s “challenging” design could be keeping new users away. Chief executive Dick Costolo told investors yesterday that the company is working on ways to make it easier for new users to sign up and current ones to find the information they’re looking for.