Facebook User ID fetcher

fb-id.py

#!/usr/bin/python

import requests
import re

url = 'https://www.facebook.com/zuck'
idre = re.compile('"entity_id":"([0-9]+)"')
page = requests.get(url)
print idre.findall(page.content)

# One-liner
# python -c 'import requests, re; print re.findall("\"entity_id\":\"([0-9]+)\"", requests.get("https://facebook.com/zuck").content)[0] + "\n"'

Is there a way to verify a set of numbers in a file to see who has a Facebook account?
Using python