ネイティブが教える英会話のジェムスクール☆Teachers☆

How do you stay in contact with people? Do you give them a call every once in a while? Maybe send an occasional email? Or do you send them a message through Facebook, or maybe even face time with Line or Skype? Today, there are so many ways you can talk to a person, so there is no reason not to say anything, right?
Well, I for one am awful at trying to stay in touch with people. Although it is difficult to talk to someone via Skype or other instant messenger on the other side of the world (due to the time difference), it is still perfectly reasonable to leave a message for them to respond to. And yet I don't. Sometimes I don't respond to a message left for me for a few days, maybe even a few weeks. Sometimes I don't respond to a message at all. And it could be anyone who tries to contact me. My best friend, a former classmate, even my own mother. I don't know why I am like that, and I don't really like that I am like that. Of course I can change that about myself, but "old habits die hard", you know?
I wonder if anyone else has the same issue? I'm sure there are some people you will respond to faster than others, but is there anyone who won't respond to everyone equally? I can't be the only one.