When trying to link someone's answer from another post, there is already a button that allows us to get an URL for that response.

Now, when clicking it, the only thing it does is changing the URL from the Navigation bar. 

It would possibly be better if it copied the URL to the User's clipping board instead of making him go and select the URL and copy it.

As an aditional, and probably a bit harder to do, when linking to someone's answer from another post, a "post-preview" option would be cool, showing at least part of the linked answer, instead of making the user navigate from one post to another.