Do you feel sad?

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In this tech age, I am not surprised if everyone has many friends they met online. Most of us belongs to an online chat place or other. Yesterday I recieved news that two of my longtime online chat buddies have left our chat community without saying a word. I am frankly hurt by their action, I thought I was their friend. But I am more worried because they left in a big hurry, leaving nothing behind except alot of rumors. Have you ever gone through this before? How did you feel and how did you react?