This is a sample status menu (appindicator) python 3 script. Via this script you can switch off the screen and open Facebook via google chrome.

mystatusmenu.py

#!/usr/bin/env python3

# Copyright 2014 H. Thilina C. Piyasundara
# 
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# 
# http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from gi.repository import AppIndicator3 as appindicator
from gi.repository import Gtk as gtk
import subprocess
import sys

def screen_off(self):
    subprocess.call(["gnome-screensaver-command", "-l"])
    subprocess.call(["xset", "dpms", "force", "standby"])

def exit_menu(self):
    sys.exit(0)

def run_facebook(self):
    subprocess.call(["/usr/bin/google-chrome", "http://www.facebook.com/"])

if __name__ == "__main__":
    indicator = appindicator.Indicator.new("My Menu", "tray-new-im", appindicator.IndicatorCategory.APPLICATION_STATUS)
    indicator.set_status(appindicator.IndicatorStatus.ACTIVE)

    menu = gtk.Menu()

    screenoff = gtk.MenuItem("Screenoff")
    screenoff.connect("activate",screen_off)
    screenoff.show()
    menu.append(screenoff)

    fb = gtk.MenuItem("Facebook")
    fb.connect("activate",run_facebook)
    fb.show()
    menu.append(fb)

    exit = gtk.MenuItem("Exit")
    exit.connect("activate",exit_menu)
    exit.show()
    menu.append(exit)

    menu.show()
    indicator.set_menu(menu)
    gtk.main()