The concept of community has been evolving rapidly since dawn of the internet - just a few short years ago, "experts" were mourning the end of traditional communities. Our personal communities can now extend worldwide, and may have some of the same qualities of the traditional neighborhood. Of course, this world can never, by nature, replace human contact. You can't go out and socialize with friends thousands of miles away. You can talk - even face to face - with good friends.
It's worth keeping this all in perspective. If we're to look at all forms of communications over the past 150 years, this is something that is still very much in its infancy. We've likely seen just a hint of the fundamental changes in store for our society in the decades ahead.