Twitter admits some private Circle tweets were accidentally made public due to 'security incident'

• A "security incident" led to Twitter Circle tweets being viewable by the public.
• Weeks after users began reporting the issue, Twitter sent affected users an email acknowledging the privacy bungle.
• Twitter Circles are meant to be a personally curated private audience of users.

Weeks after the incident, Twitter finally acknowledged that tweets shared to some users' private Twitter Circle were made public due to a bug. 

Impacted Twitter users received an email from the platform on Friday informing them of a "security incident" that caused their semi-private tweets to be seen by more than just close friends in their Twitter Circle.