this is how to post on your application page on facebook using only Tornado, no more libraries ;)

tornado_fb_poster.py

#!/usr/bin/env python
#-*- coding:utf-8 -*-

import tornado.auth
import tornado.escape
import tornado.httpserver
import tornado.ioloop
import tornado.options
import tornado.web
import tornado.gen
from pymongo import MongoClient # no need for asynchronous calls since there will be always only one call at time, no other clients
import sys
from urllib import urlopen
import datetime
from base64 import urlsafe_b64encode
import base64
 
from tornado.options import define, options
 
define("port", default=8888, help="run on the given port", type=int)
define("facebook_api_key", help="your Facebook application API key",
       default="your application id")
define("facebook_secret", help="your Facebook application secret",
       default="your application password")

message = "Hello there, here is my message"
    
class Application(tornado.web.Application):
    def __init__(self):
        handlers = [
            (r"/", MainHandler),
            (r"/auth/login", AuthLoginHandler)]
        settings = dict(
            cookie_secret="generate a cookie secret",
            login_url="/auth/login",
            xsrf_cookies=True,
            facebook_api_key=options.facebook_api_key,
            facebook_secret=options.facebook_secret)
        tornado.web.Application.__init__(self, handlers, **settings)
     
     
class BaseHandler(tornado.web.RequestHandler):
    def get_current_user(self):
        user_json = self.get_secure_cookie("alien")
        if not user_json: return None
        return tornado.escape.json_decode(user_json)
     
     
class MainHandler(BaseHandler, tornado.auth.FacebookGraphMixin):
    @tornado.web.authenticated
    @tornado.web.asynchronous
    def get(self):
        self.facebook_request("/me/accounts", self._on_accounts, access_token=self.current_user["access_token"])
        
    def _on_accounts(self, account):
        if account is None:
            # Session may have expired
            print "on accounts failed"
            return
            sys.exit()
            
        print "here we go!"
        print account
        for acc in account["data"]:
            if acc["id"] == "id of the page which is the same as the id of your application":
                print acc["access_token"]
                self.facebook_request("/id of the page which is the same as the id of your application/feed", post_args={"message":"{0}".format(message), "link": "http://www.example.dz/"}, access_token=acc["access_token"], callback=self.async_callback(self._on_page_post))
                print "success!"
     
    def _on_page_post(self, post):
        if not post:
            # Post failed
            return
        sys.exit()
     
class AuthLoginHandler(BaseHandler, tornado.auth.FacebookGraphMixin):
    @tornado.web.asynchronous
    def get(self):
        my_url = (self.request.protocol+"://"+self.request.host+"/auth/login?next="+tornado.escape.url_escape(self.get_argument("next", "/")))
        if self.get_argument("code", False):
            self.get_authenticated_user(
                redirect_uri=my_url,
                client_id=self.settings["facebook_api_key"],
                client_secret=self.settings["facebook_secret"],
                code=self.get_argument("code"),
                callback=self._on_auth)
            return
        self.authorize_redirect(redirect_uri=my_url,
                                client_id=self.settings["facebook_api_key"],
                                extra_params={"scope": "publish_stream, manage_pages"})
        
    def _on_auth(self, user):
        if not user:
            raise tornado.web.HTTPError(500, "Facebook auth failed")
        self.set_secure_cookie("alien", tornado.escape.json_encode(user))
        self.redirect(self.get_argument("next", "/"))
    
tornado.options.parse_command_line()
http_server = tornado.httpserver.HTTPServer(Application())
http_server.listen(options.port)
tornado.ioloop.IOLoop.instance().start()