Messages claiming to link to free iPhone 4 offers or tools to help you find out who has unfollowed you on Twitter. Some of the messages posted from innocent users Twitter accounts have claimed that its easy to get your hands on an iPhone 4. Others seem to suggest that they offer a way to easily monitor who unfollows you. Twitter acknowledged earlier this week that the service was suffering from an unfollowing bug The bug is being blamed on a bug that has been fixed by Twitter users.”]
Source: https://grahamcluley.com/check-your-twitter-account-for-rogue-applications/