A handful of us donated to Whoknowsit to so he could buy ALL the upgraded guides for MoP for all of us. That was an investment into THIS community not into torrents or into any other. We want it to remain safe for us to continue to use. Whoknowsit is smart enough to know what to look for to take out Zygors' tracking info, but he knows he is NOT perfect. That is why he is STILL careful.
Often the name modification (or "mod" for short) is used interchangeably with AddOn. More specifically, a mod is a third-party AddOn that alters or enhances some aspect of the game's interface. Mods can perform a wide variety of tasks, including adding new buttons to the screen, altering the built-in player and party frames. In extreme cases, mods completely supplant the standard game's interface, usually offering more advanced functionality.