Fitting web apis into a filesystem metaphor isn't always straightforward. For instance, it is common to POST into a container URI (which we represent as a directory) and have no control over the name or id of the object which is created. This is the case with Facebook posts.

  echo "foo" > /facebook/me/posts

would imply overwriting the posts directory, which is not allowed (either on pigshell or on unix)

OTOH, asking the user to do a

   echo foo >/facebook/me/posts/post-11oct2014

sets up the expectation that the post will be named that way, when it will most likely be a long numeric id. Thus, the trailing slash. Not perfect, but the best compromise I could think of.