henry0 - 11:31 am on May 15, 2012 (gmt 0)
Unfortunately this does not account for faked/bot created accounts.
AFAIK there is no means to weed out faked from man-made accounts.
Although one of the bots characteristic is their capability to answer a tweet in a millisecond.
This combined with a few more bot "fingerprints" such as profile similitude and other suspicious feaures should allow to create a decent bot killer tool.