Initially, Twitter provided the list to help them. As the Biz Stone writes in the Twitter blog
About a month or so ago we noticed a certain percentage of new users were signing up and then not following anyone. When you don't follow any other accounts on Twitter the product is not as relevant as it could be. To improve the user experience, we started suggesting some accounts to follow.However, with time the suggestive feature flared up controversies. Evidently the list was personalized and seemed biased in certain instances. Clearly, if someone doesn't find John Hodgman interesting which Twitter thinks he/she is at complete loss. You might not enjoy the service that doesn't suggest people of your interest like what you get in Facebook. Simply you might find no reason to continue the service.
Now that Twitter is looking to better its suggestion list, in the meantime we can look for an alternative. Although not a front-runner Twellow seems a prospect, which offers suggested users for Twitter on more personalized level. This could be quite useful. It's designed to connect Twitterers with similar interests.
As for now, if you are waiting for Twitter's revamped suggested user list, you can rely on Biz Stone's words
in its stead will be something that is more programmatically chosen, something that actually delivers more relevant suggestions.