Of course. The nodes you write are your own intellectual properties; you didn't agree to any copyright assignment or so when you signed up here.

Maybe people object if you do it the other way round.

But IMHO you should include a backlink to the original post.

If it would be beneficial to have all of the responses made available to the PerlMonks community, it may also be good to disable commenting on the post, and (as previously mentioned), direct respondents to the Perlmonks post.