import twitter
import networkx as NX
import time

# Create an authenticated Api object in order to download user data
api_user='your_twitter_id'
api_pswd='your_twitter_password'
api=twitter.Api(username=api_user,password=api_pswd)

# The seed user to be analyzed
seed='someone_who_needs_friends'

# Now create network
k=2 # Number of snowball rounds (WARNING: k>2 will most certainly exceed the Twitter API rate limit)
twitter_net=snowball_build(api,seed,k)