Here is an article by Andrew Santella, The Sin Box: Why Have Catholics Stopped Lining Up At The Confessional?
I like Santella's last paragraph. I think that is where the meat of his article is located. Confessing on an Internet chat room has little remorse or ownership attached to it. It can be done anonymously, and requires no real soul searching. When the confessor is finished, there is no one to say, "That was wrong."
Confession is hard work. It requires us to examine ourselves, and then accept that we are sinners who fail. It is not meant for us to wallow in our guilt and sin, but to accept that we have done something wrong. God's grace reminds us that in spite of our failings, God loves us and offers forgiveness.