Does it really matter how many duplicates were stolen?
Recently hackers affiliated with Anonymous broke into twitter servers and claim to have stolen 55,000 twitter account usernames and passwords. The 55,000 accounts were published to Pastebin on five different pages. However, twitter wants everyone to know that the hack was not as effective as it sounds.
According to twitter, there are 20,000 duplicate usernames and passwords and many of them are inactive accounts that were deactivated for spamming. Duplicates and spammer accounts aside, it's still disturbing the twitter was hacked information such as this was stolen.