蜜子
[mì zi]
Honey child/darling, it implies sweet, intimate, endearment. People tend to use it among lovers, friends, parents&kids. Those who use such pet-names in social media seem cute & friendly. They're likely to enjoy being doted on & treated like beloved kids, showing a desire for receiving affection or being loved/cared for. Or this user may be in relationships and wish themselves be thought as charming & adorable.