Indian operator Tata Docomo has introduced a Twitter app for its pre-paid customers that will allow them to recharge their credit and activate value-added services via the microblogging service. “With the increasing consumption of Internet and the rise of social media it makes ample sense to be present on the medium where people are spending time at present or they are likely to spend time in the future,” said Tata Teleservices head of brand marketing, Ritesh Ghosal.