I don't know all the reasons why, but I always notice an improvement in my mood on the days I have interactions with casual acquaintances. (And I'm an introvert

I don't know all the reasons why, but I always notice an improvement in my mood on the days I have interactions with casual acquaintances. (And I'm an introvert.) There have been some studies on the importance of "weak ties" I believe. I think there's just a human need for some amount of interaction, and the weak ties have the benefit of coming with very little in terms of obligation. Which helps free you from some of the major stresses that accompany deep ties.