The internet is an extension of what we do - This seems true, the internet does seem like an extension of what we do. And the way that's it's been so well integrated in our lives these days makes me wonder how much of my life is already in the net (internet).
The internet is another medium for our social networking - When you think about life outside the internet then you'll realise that the social networks we have in real life have only been continued and engaged in a different way in the internet. It is indeed a medium, a form, a method, a tool that we use to connect with others, some of course may not have stayed or reached out to otherwise.
If you watch this youtube clip that someone made, you'll see this in a quite simple explanation - Social Networking in Plain English, http://youtu.be/6a_KF7TYKVc
So this continuation of our social networks keeps us connected or not as connected - depending on the extent that we use the tools available to us. As in real life relationships, how much we share, can also mean how much we get back. But at the same time there are risks that one learns and tries to manage as much as possible - in terms of privacy, security, etc.
As people though, our desire is to connect with others our tribal and instinctive desires, and that can make us vulnerable to ourselves and others and our need to feel worthy. However, we do decide to manage ourselves online though, what you'll find is that the internet will always be there as a tool that we can use to extend ourselves with the people around. If that is how we desire to represent ourselves (as some like to stay anonymous online).
So whether you want to stay connected and to what extent, will always be up to you - for it is a tool that can be used as an extension of what we do with others...