post thanks to everyone on FB who wishes on birthday. Script by Taz.

facebook.py

import requests
import datetime
import time

from random import randrange

TOKEN = "" # add your access token here, with publish_stream permission

def main():
        todays_start_unixtimestamp = int(time.mktime((datetime.datetime(datetime.date.today().year, datetime.date.today().month, datetime.date.today().day, 0, 0, 0)).timetuple()))
        print "fetching the posts.."
        data = requests.get("https://graph.facebook.com/me/feed?since=" + str(todays_start_unixtimestamp) + "&limit=200&access_token=" + TOKEN)
        posts_ids = []
        breakit = lambda x: x.split("_")[1]
        for k in data.json['data']:
                try:
                        if 'happy' in k.get("message").lower():
                                posts_ids.append(str(breakit(k.get('id'))))
                except Exception, e:
                        print e
        comments = ["Thanks :)", "thank you :)", "thank you", "thanks"]
        payload = {}
        for each_id in posts_ids:
                # like the post
                print "Posting the like..."
                like_url = "https://graph.facebook.com/" + each_id + "/likes?access_token=" + TOKEN
                resp = requests.post(like_url, data=payload)
                print "Like posted!"
                print resp.text
                # comment on the post
                """
                print "Posting the comment..."
                comment_url = "https://graph.facebook.com/" + each_id + "/comments?access_token=" + TOKEN
                comment = requests.post(comment_url, data={'message':comments[randrange(4)]})
                print "Comment posted..."
                print comment.text
                """
        print "Done..!"
        return

if __name__ == '__main__':
        main()