Twitter has accidentally revealed the private tweets of some Android users'. Twitter's “Protect your Tweets” feature allowed people to use Twitter covertly. However, due to a bug on the social media site, these private tweets were made public. This bug has only been brought to site's attention on January 14, 2019.
Twitter has issued a public statement informing the affected users to re-enable the "Protect your Tweets" feature. This feature was disabled on a number of Twitter accounts and those accounts can now access the feature given that the situation has been resolved on Twitter's end. However, Twitter does not have a full list of affected users and the number of users with exposed tweets can even be greater.
While, this was a huge oversight on Twitter's part and as a result of which, this bug has existed ever since November 3, 2014; Twitter has assured users that, after this incident, they have resolved issues relating to the "Protect your Tweets" feature and other associated bugs.