Some people use this site as a chat room. They think they make lots of so-called "friends" here. How silly those people are!!
They should ask themselves a question: How well do I really know about my so-called "friends" after chatting for 1, or 3, or 6 months? And most likely they find the answer to be: Almost NOTHING.
Then suddenly they realize so much time they have wasted on their 留言板.