Researchers say they uncovered a number of large fake account networks, with one having up to 350,000 accounts linked. According to the research, some of the accounts are used to help boost follower numbers, to tweet spam messages, and promote specific interests, amongst other reasons.
It also discovered some of the accounts appeared to be run by bots which act in a different way to a typical bot.
Subsequent to the research being published, they discovered a network with 500,000 linked accounts.
"What is really surprising is our questioning on the whole effort of bot detection in the past years," said Dr Zhou. "Suddenly we feel vulnerable and don't know much: how many more are there? What do they want to do?"
A Twitter spokesman said the social network had clear policy on automation that was "strictly enforced". Up to 350,000 Fake Twitter Accounts Discovered in one Network [bbc.co.uk]
"While we have systems and tools to detect spam on Twitter, we also rely on our users to report spamming," he said.
Rightly so, this automation devalues the system.
If I notice a bot, or spammer following I block them right away. I don't always have time to report them.