There is a fair bit of truth to what you have just written.
As modes of communication change, so, too, does how we interact with one another, and I'll concede that there is a lot more to human relationships that the categories 'colleague', 'stranger', 'acquaintance', 'family', and 'friend'. There are individuals who were a number of these label simultaneously, the one does not necessarily exclude the other.
And, I will also acknowledge that the online universe has transformed vast swathes of our world and how we relate to it.
I joined MR six years ago; as was the case with many others, my joining was prompted after a period of what I learned was called a 'lurker'; in turn, that had come about because I a had myself a MBP as a birthday present and had questions as the world of Apple was alien to me.
Anyway, I joined, I lingered, I stayed and I be became an active participant; over time, you get to know people, and start PMing and being PMed. While I have no time for FB (and no interest in, and simply don't even 'get' the idea of FB), there are individuals on this forum whom I would - to my astonished and delighted surprise - have come to regard as friends, people who, should chance and opportunity arise, I would be very happy to meet and chat with, in The Real World.
Needless to say, this was not a state of affairs I would have considered remotely possible some years ago, when I viewed online interactions which were mainly social (as opposed to writing emails or Skyping individuals whom I already knew or know) as somehow self-indulgent or trivial. I know now that they are not, that - as with most encounters - how one interacts has an effect on the tone, character, content and nature of the actual encounter - and I now know that it is another, ever evolving, layer of communication and that my life is far the richer for that.