Its not that net friendship is bad or good. What you need to understand that without personal interaction, the totality of a relationship cannot be judged, as chatting on net, or even on phone might not be the same as real interaction, and the what you feel about the person much be contrasting in real interactions. Also as an adult all of us need to take our individual decisions, we don't need to follow others opinion, at the same time one should hear them, and give them a thought. Do not let your relationships in the real world be affected by your online life.