B1
a place on a website where you can leave messages for other people to read
Dictionary examples:
Someone on the message board asked how to cook water. (0.0)
I posted on the message board asking how to turn off caps lock. (0.0)
The message board exploded with memes after the teacher's funny mistake. (0.0)
There's a lot of discussion on the message boards about this issue. (27.9)