You shouldn't want to share direct links, the directory where the actual content resides shouldn't even be publicly accessible, owncloud does this very well.
I don't think that's what he meant. Let's say you have a document that you want to share with your friends who don't have an Owncloud account on your instance. You click on share and get a publicly accesible link like "example.myowncloud.com/ji7H2i".
I don't know if Owncloud is able to do this, but it works with pyd.io.
