Dear Editor,

We would like to share ideas on “Closeness to friends explains age differences in positive emotional experience during the lockdown period of COVID-19 pandemic [1].” Cavallini et al. concluded that “our findings reinforce the link between perceived ….adults to increase the closeness to their social network [1].” Closeness to social network is necessary for positive emotion. However, it might not be possible in some areas. In our areas in Asia, where the infrastructure is limited, it is usually difficult to promote closeness of social network. In addition, we have to control the use of social network. Too much use can cause problem. Addiction to social network might occur, and it can cause negative effect such as anxiety [2], and information overload [3].