I think people use Facebook in many ways, based on their own personalities. I know I had 1000's of friends, was playing major Zynga games that required it to move ahead, etc. and got more enmeshed in playing games than I liked so I deleted everyone I did not "know" from my account and sent an email to my actual friends/relatives that I would not be on Facebook very often from then on. I went to another health-related site and started working there instead and, to this day, I only visit my Facebook page once a month or even less.

My husband, who knows/cares nothing about his Facebook page has many old girlfriends on his page, his ex-wife, etc. They are all friends of his. He has introduced me, online, to his high school girlfriends (we're 60-70 years old) because they have contacted him and are "weird"/he does not understand them but I do better because I am another woman :-) He is fine with being contacted by anyone who wants to contact him from his past and he'll chat back and forth a bit but he, too, does not use his Facebook page except rarely. I think most old friends may/may not contact one another often, etc. depending on where they live, what's happening in their lives now, all that. I know I am friends on Facebook with friends I've had since I was 16 but they live quite a distance from me and have varying interest in their Facebook pages, whether someone contacts/answers me on Facebook or not does not influence much in my life now. But I am sure there are others, such as you seem, who are my friends and more "into" it and maybe hurt by my seeming lack of response to them, when my response/lack of response is really all about me, not them at all. Our perceptions are ours and not necessarily correct/helpful/what others we are perceiving about would agree feels true to them.