They are decoration for a cool farm. Also they give you a lot of xp compared to the decorations. So if your looking for xp, buy them.
buildings in farmville
no
You can't.
No
Barns do nothing in Farmville. They are just buildings which you can build for decoration.
There is no way you can go inside a building on farmville.
No, you can't go inside in any of the buildings in Farmville.
yes you now can
It can not be done
You have to buy one from the Market under Buildings.
you can store anything but animals and bigger buildings
You can store things in barns and tool sheds.