Twitter considers enhanced version of TweetDeck for professionals

Twitter has started surveying users to check their interest in a new enhanced version of its TweetDeck product, raising the possibility that the company is considering a paid version of its service.The move by Twitter comes in the wake of its almost flat revenue growth and a lackluster increase in the number of its users in the fourth quarter in comparison to the company's social networking peers like Facebook.A subscription-based version of its service would be in line with the strategies of so