Most of the public radio hosts I know continue to do work well after the "on air" light goes off.
The Federal Communications Commission (FCC) requires all radio and television stations (not just public radio stations) to identify themselves hourly.
A great deal of what we say on air is written by someone else. A great deal is not.
A board is the electronic console that controls what you hear on your radio and, more importantly, what you do not.
Write what? I don't know, but like...I've had a Squarespace account for quite some time now, and haven't really taken advantage of the blog feature.