Minecraft, Giantitp, Penny Arcade and Steam Store

[t209]

What does Minecraft, Giantitp, Penny Arcade and Steam Store have in common? They are the popular things even if they didn't appear in Ad banner on the internets. They also use word of mouth advertisement for the new comers. Are there any popular things that are popular with the use of word of mouth.

[Brother Oni]

Isn't this how viral/stealth marketing campaigns work? Word of mouth, or the implication of it?

[Tengu_temp]

GitP is nowhere near as big and popular as the other three, though.

[t209]

Isn't it ironic that Giantitp adbanner is uphere (at current and see wayback machine if you are in the future) when I started the topic about popular forms of media that only use "word of mouth".
Penny Arcade and CAD comic + Dominic Deegan (more hatedom)+ Rice boy

[Fallen Angel]

What ad banner? I dont' see it. (I use Firefox 13/Adblock/Fanboy's List)