Report for spam accounts with '0' name in twitter

zerokiller.py

#!/usr/bin/python
# Depends on tweepy
# easy_install tweepy

import tweepy

consumer_key=""
consumer_secret=""
access_token=""
access_token_secret=""

auth = tweepy.OAuthHandler(consumer_key, consumer_secret)
auth.set_access_token(access_token, access_token_secret)

api = tweepy.API(auth)

followers_ids = api.followers_ids()
print "%d followers" % len(followers_ids)
all_zeros = []

while followers_ids:
    chunk_ids = followers_ids[:100]
    followers_ids = followers_ids[100:]

    followers = api.lookup_users(user_ids=chunk_ids)
    zeros = [f for f in followers if f.name == '0']

    print "Got chunk of %d followers, number of 0's: %d" % (len(chunk_ids), len(zeros))
    all_zeros += zeros

for user in all_zeros:
    print "Reporting for spam '%s' (%s)" % (user.name, user.screen_name)
    api.report_spam(user_id=user.id)

do you know what is the limit of report_spam i tried several times but i couldn't find it nor detect it