Wallwisher is useful as it is a place for us to share short information among one another. One thing I don't like about wallwisher is that it limits the letters we used to 140 letters. That means that we need to shorten on what we say. However I could write on seperate sticky notes,which is more troublesome. Wallwisher is also a good application for CCAs as members of a CCA can discuss matters on a wall without meeting each other,which is very convinient.