Gets number of currently online friends on facebook

gistfile1.py

import webbrowser
import os
import urllib2
import json
import urllib
from time import strftime, sleep

def write_to_file(data):
    if os.path.exists("fb_data.txt"):
        with open("fb_data.txt","a") as out_file:
            out_file.write(data+"\n")
    else:
        with open("fb_data.txt","w") as out_file:
            out_file.write(data+"\n")

app_id="1415058882068180"
api_url="https://www.facebook.com/dialog/oauth?client_id={}&redirect_uri=http://example.com&response_type=token&scope=friends_online_presence".format(app_id)


print "Press enter to open web page granting app access"
print "Once you allow access to data you'll be redirected to example.com page"
print "Just copy the whole URL you got redirected to here and press enter again"
print "Press enter to open web page now..."
raw_input()
webbrowser.open(api_url)
print "Facebook app opened"
url_response=raw_input("Enter url you got redirected to and press enter again")
token=url_response.split("#access_token=")[1].split("&expires_in")[0]

sql_query="SELECT uid, name FROM user WHERE online_presence IN ('active', 'idle') AND uid IN (SELECT uid2 FROM friend WHERE uid1 = me())"
query_url="https://graph.facebook.com/fql?"

request_timeout=120 #seconds
data = {}
data['q']=sql_query
data['access_token']=token
url_values = urllib.urlencode(data)

while True:
    response=urllib2.urlopen(query_url+url_values)
    json_resp=json.load(response)

    output="{} - {}".format(strftime("%Y-%m-%d %H:%M:%S"), len(json_resp['data']))
    write_to_file(output)
    print 'waiting {} seconds'.format(request_timeout)
    sleep(request_timeout)

When I run this script under Windows 7 x64 with Python 2.7, it doesn't writes a new line, like \n should do.
I tried several other commands like os.linesep and \r\n with no effect.

Could you make this script Windows compatible? Or I'm doing something wrong?

Also nice would be an automation of getting the access_token...

Tanks, Leo