The wall tag contains 233 questions. Impressive at first, but about 90% of these questions are related to Facebook, and should be using the facebook-wall tag instead. The rest use it as a meta tag, except for one (mentioned in comments).
At first I thought we could synonymize and merge wall and facebook-wall after removing the wall tag from all the questions which use it inappropriately (there's only 27 of them). This seems like the best option, but uses up a very general word "wall" specifically for Facebook. Perhaps we could just send them all to the other tag instead and then get rid of the wall tag, so they'll at least all be on the other tag.