I honestly can't remember exactly. Hmmm i think maybe someone provided a link or said atrl in the Billboard H100 top 10 article comments thread that I used to read every week
I know it was September 2012 so I think I googled info on Rihanna's new lead single and read every page of the speculation of what the Diamonds World Tour would be and if she was actually releasing another album. Then I read all of Nicki's The Boys thread and found SYG, the Kesha base etc and lurked through mess like Lotus and Warrior until I could sign up.
someone i follow on twitter posted some predictions from the billboard thread and it said wdym was debuting at #1 so i asked them what website they got it from and i started lurking on the BB thread for a while then i started lurking on other threads and alot of peoples posts were funny so i joined when regisitrations opened