For the people who where wondering who herobrine is i got the history right here

the first herobrine screen shot was him in fog,it wasn't popular at first,but then more screen shots came up

then people started making youtube vidios about herobrine to freak a lot of people out,after that toturials to find him
for example the summon with the gold block's,mossy coble,redstone torch,netherrack and flint&steel

other people made vidio's about herobrine's hole thing with redstone torches to bedrock.

in 1.7 notch said that he was removed and also posted that on twitter,i think that was because people were
so anoying about him scaring the crap out of them.

now that the endermen 1 person made a blog about them bieng the servants of herobrine,that was proven wrong
when people said endermen had purple (nether) pupils

in 1.9 pre release there was a new disk called 11,you might of heard of it from the yogscast,
a guy made a vidio about him acting with the same sounds as in the music disk
some people claim the caughing person in the disk is herobrine

my ideas about herobrine are that the npc's will give quests about finding out whats with herobrine and
why did endermen attack him,maybe there will be something to do with the nether and the ender.
the history of herobrine lies in later patches