Nowadays, the pace of social development is getting faster and faster, and most people are under greater pressure in life and work, and interpersonal communication becomes relatively less. This comment from the other side shows that they haven't seen each other for a long time and expressed their thoughts.
When you reply, you should focus on responding to each other's thoughts, such as missing each other often and not seeing each other for a day, such as Sanqiu, to express your mutual affection. Friends will be very happy to see similar replies, and they can take this opportunity to meet and contact their feelings, which is more conducive to the long-term development of friendship.