The article, entitled “Who is tracking health on mobile devices: A behavioral logfile analysis in Hong Kong”, has been published on JMIR mHealth and uHealth by Lu Guan, Tai-quan Peng, and Jonathan Zhu. In their article, they analyzed users’ mHealth app activities from a representative panel of about 2500 users in Hong Kong. Their findings suggest the use of mHealth apps demonstrates a significant temporal pattern and such temporal pattern is moderated by individuals’ demographic characteristics.