I totally understand and even I wont support such things but just because you mentioned it on twitter doesnt breaks any rule first of all and at the same time you do want to tell you audience that you have something interesting going on HN. specially the rate HN post are getting posted whats else choice you have. Most of the people hardly visit 2nd page atleast the people i met.
But with due respect isnt HN's model is already broken? just because people aren't openly accepting it doesnt mean their friends and in most cases their employee didnt upvoted/commented for the sake of the company.
Note: My intention behind the last para is not to promote such things.