Sometimes the lonely pay to say good night

Weng Biying sold more than 3,000 "good night" text messages to strangers online over the past three-and-a-half years.

Her reason was simple: To introduce a little more courtesy to people's everyday lives.

"Although the overall standard of living continues to improve, many people still lead a relatively uncultured life, which lacks both subtlety and attention to detail," said Weng, 28.