Does that work on older browsers? (Meaning IE8 and above)
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IE8 supports pseudo elements with few catches (none that affect this use case) http://css-tricks.com/browser-support-pseudo-elements/
I used to do this with a right-border, not sure if that's a best practice these days or not. You could do something similar in between the date/link/comment sections underneath a given link as well (since it logically is a list).
right-border prevents users from copying the "|" character, which always seemed like the correct behavior to me.
I think generated content (i.e. created by using the :after pseudo-element) also is not selectable or copyable.