A lot of these schools send out their acceptances either at once or by discipline. For example, I know Harvard releases decisions at once and Yale typically does it by discipline (albeit, both are typically of the last schools to send out their acceptances)-- I know this from friends who have gone through this process and by speaking with professors. Historically, these decisions are released in January so prospective students have time to make travel arrangements for visiting weekends. I agree, a lot of people don't know about this website, so that is where I would think maybe the accepted students just aren't on here this year??
Maybe we shouldn't give up hope, but I'd also say, let's not get our hopes up. An unexpected surprise is better than being let down.