What's true for you is not necessarily true for others. Are you still in touch with the people you knew in kindergarten? How many years ago was that? Consider t

What's true for you is not necessarily true for others. Are you still in touch with the people you knew in kindergarten? How many years ago was that? Consider that some people might have two or three times that many adult years of changing cities, changing jobs, changing life circumstances, each change resulting in more people with whom staying in touch is not automatic as it is with current classmates or coworkers. Some of them might have less free time because of family and other obligations. Some of them might have disabilities. Some might be more introverted than you are, which does not mean that they need human contact less but that it might take more effort to sustain it. Many people who are not exactly the same as you might find great value in having a lightweight way to maintain those tenuous contacts. Deriding them as not "true friends" or assuming that only "true friends" matter is very egocentric and privileged.