Have you experienced 'loneliness' or 'left-out' online / in virtual?

My term of 'online or virtual loneliness'. This can be an appropriate term. Is this term used? Situation where you have added quite many contacts list in online network but you sensed you're not noticed. Or people ignore your confirmation or messages, whatever the reason you're wondering. You leave comments but seldom get any reply, comments or messages. The sense of being left out, virtually.