The way I see evangelism is by connecting to other people. Everyone has their own story (life, things you like, experiences, questions, etc.). On these stories we normally connect to other people: you have something in common with someone. Evangelism is being who you are and to share this. If you are a Christian, your relation with God means something in your every day life. This will show: others will notice (that is: if your not hiding it). This is visible in the following image (the image is inspired on Youth For Christ: The Art Of Connecting).
Evangelism as a way of life (or maybe better: as a part of you) is to connect with other people. In this connection show God's story. If someone is searching for answers (metaphysically) join this search. Have an open mind and be a fellow human being. Show them your personal answers.
How does this relate to evangelism through the Internet? Web 2.0 is focused on personal experience and connecting to other people. This makes it easier to connect to others and show who you are. Communicating through the Internet seems to lower barriers that 'normal' seems to have. People tent to be more open about what's keeping them busy. It's easier to talk about your feelings and uncertainties over the web. This dynamic makes it easier for you to have a meaningful conversation. Churches should also be present on the web, not only to provide information, but giving a platform for discussion and to ask and answer questions. Or, for example, provide a course on the basics of Christianity.
And if one of your friends want to know more? Then what? That'll be part three.