Herobrine was thought to be just a glitch or a virus in the game so Notch "cleaned" him out of the game. But in the new version of minecraft, a kid saw this "virus" again and more and more... After those incidents less and less people were quiting minecraft because of him. Notch still isnt admiting he is real. He only wanted to make his"long lost brother", Herobrine, in the game. But apparently he did something wrong in the game. Every time he appears there would be random fog around you andin the distance you would probably see him or when you go to bed, you will be in a dream where you have to face Herobrine and if you lose, you die when you wake up but when you live you get anything that Herobrine drops. But he will be back or he will have his revenge, as he will say. One time when i was watching my friend play minecraft, i saw words but i think they were backwards. Then she lost all her stuff... ALL OF IT!! then when i was playing minecraft, i saw some other words and it said kickroundhouse or smething like that.
So, is he real, or not? You decide.