Twitter admits a 'security incident' allowed private Circles messages to be seen by anyone
Following numerous complaints from users concerned that the Circles feature of Twitter was broken, the company has conceded that tweets that were supposed to be visible to only a select number of people were in fact accessible by anyone.
The idea of Twitter Circles is that messages can be seen only by people who have been added to a Circle. But Twitter has now revealed "a security incident that occurred earlier this year" that ignored privacy settings.