Please don't say this is in the wrong section because theoretically it could work on diablo 2 or starcraft if they have clans there.
Okay first you need to know how to make crappy websites with forums on freewebs.com or something Then go find a clan thats pretty large probably kinda noobie talk to the chief and make a deal with him to make him a website and convince him to tell his clan members to sign up and use it. Keeping in mind this is hopefully a large clan say you get about 50-70 people to sign up then see how many stupid kiddies made there password on the website the same as there wc3 account. There are alot of stupid people out there and you'll probably catch some of them my friend did this but he was aiming for a specific kid he really hated for many reasons and it worked. But i gave him the idea origonally.