Some of the b1g boards are ghost towns as they have non rivals boards.
Others, like Penn state, Nebraska and Indiana (Basketball) are run by Nazis. If you speak ill of their beloved programs in any way you are banned immediately.
This site seems pretty active but seems to combine all topics into one.
The Iowa board you can pick basketball, football, wrestling and the really good off topic board and the traffic is excellent.
It is a bit frustrating on the Iowa board that they are probably too loose with opposing fans. The trolling gets pretty bad at times.
The problem with that is Iowa fans then make a point of attacking other boards as retaliation and get kind of nasty on our own board and it lowers the reputation of Iowa fans in some fan bases. (Mainly those 3 boards I mentioned.)
Overall I've seen moderators say before that Iowa is one of the more active Rivals Boards out there.