With modern technologies and social network such as FB, it created an illusion that we are CONNECTED with friends/family. Reality, we are not. We may roughly know what's going on in their life and that's because it pops up on our home screen. It's ironic how gaps are widened with so much connectivity.
Therefore, what I did was, whenever someone pops up in my mind, I would immediately drop he/she with a 'Hi, how have you been?' message. It doesn't take a lot and it's a lovely gesture. I know I would like that. Don't you?