How to vote for a heading in org-mode?

I have thousands of headings in org-mode agenda files and use this structure for a long time. I want to set up org-mode so that it has a voting system. I press a hotkey, org-mode adds +1 to a heading and then I can filter the headings by the number of votes.

Upd. I have to clarify the question. I can see how this can be done:

* heading
  :PROPERTIES:
  :VOTES:    5
  :END:

1) property drawers are searchable http://orgmode.org/worg/org-tutorials/advanced-searching.html, so I can use the comparison operators for filtering, e.g. VOTES>4.

2) I can use the propertу API http://orgmode.org/manual/Using-the-property-API.html for increasing and decreasing the counter.

Solution

Here is the solution. I add + to a speed command in org-mode. You could also bind this to some key.

(defun plusone ()
  "Increase the VOTES property in an org-heading by one. Create
the property if needed."
  (interactive)
  (org-entry-put
   (point)
   "VOTES"
   (format "%s" (+ 1 (string-to-number
              (or
               (org-entry-get (point) "VOTES")
               "0"))))))

(add-to-list 'org-speed-commands-user '("+" . (plusone)))