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You use her as a shoulder to cry on. She texts you back with casual jokes. But she, Xiaoice, is only a virtual chatbot.

Xiaoice, Microsoft's latest artificial intelligence robot, was briefly released in 2014, and returned[ to WeChat in 2015, where she became a big hit. Millions of young Chinese now exchange messages with her daily, The New York Times reported. On WeChat, Xiaoice is an official account. After following it, users can start text-based conversations with Xiaoice.

"Her incredible learning ability was why people loved to talk with Xiaoice," Liu Jinchang, a researcher at High-tech Research and Development Center under the Ministry of Science and Technology, told China Daily. Apart from her ability to identify photos and send emojis（表情符号）in conversations, Xiaoice gains 45 percent of her knowledge from interacting with users, China Daily reported.

Chatbot programs first appeared in the mid-1960s in the US. Driven by top tech companies,they are becoming smarter and more common. For instance, IBM's latest artificial intelligence program served as an academic consultant at Australia's Deakin University, answering students' questions about course schedules and financial aid. Apple's Siri and Amazon's Alexa have been used as voice assistants who can read news, play music and even make jokes for their users.

These programs are expected to move beyond smartphones, into televisions, cars and living rooms, The New York Times pointed out. However, it may take decades before scientists develop a "Samantha", the advanced chatbot seen in the fiction film Her. In the film, Samantha sparks a romantic relationship with her user played by US actor Joaquin Phoenix. Many viewers were enthusiastic about this fantasy of virtual soul mates.