Out of all the different ways to network I believe the two that will consistently get you the farthest are knowing someone and face to face interactions. Social networking through sites are great for a booster or to remind someone that they have just met you and you are interested in communicating with them, but they should not be the basis of your communication. I also believe the opposite is true. Have 100% communication be face to face is just not practical. You need to have a nice balance of both in order to network properly. People need to know that you are up with the times in social networking but they also need to know that you can handle face to face communication.
Aren't we lucky that we have all these forms of networking readily available to us?