I was hoping to catch this sooner, but the forums here have just hit the 1,980 registered user. As such, here’s the top billboard single (in the US) for 1980, Blondie’s “Call Me”:
We’re around 750-950 active daily users (unique). This is approximated between Google analytics and our own hosted piwik. (This is likely about 30% low roughly based on probable ad-blocker use, which I encourage).
Speaking of which, you just reminded me to check and we’re up to 1,984 registered users, so here’s 1984’s top billboard track for the year (US), Prince’s “When Doves Cry”: