I joined five years back when I heard about Bitcoin through ForumPromotion. As I was an active users on various forums, I searched for Bitcoin forums and Bitcointalk was the first one that came up. Hence I registered but due to the 360 seconds policy, I stopped visiting Bitcointalk after making a few posts. I came back a year or so later when I discovered the "secret money-making tactic" of Bitcointalk - signature campaign.