Two frozen tortoises. [Photo/Wechat]

Dongzhule (frozen) became a hot topic on Chinese social media and ranked among the most-searched words on China's top search engine Baidu during the weekend when the temperature reached record low in many places.

Some iPhone users claimed that the battery of the phones automatically drained off when they tried to use their device in the freezing weather. An Internet user named wanmei said the phones automatically turn off when the weather is too cold as the phone's ideal operating temperature is between 16 and 22 degrees Celsius.

A picture of two frozen tortoises in a tank began circulating on instant messaging app WeChat. Many Internet users expressed their concern about the two animals.

While some questioned where the animals' owner was and why the tortoises were left alone, an Internet user named zuiai said the tortoises may be in hibernation, since some are prone to hibernate in cold weather, while another Internet user named yuanshan expressed worry that the frozen animals may die because they can't breathe.