Twitter bug been exposing private tweets since 2014January 18, 2019
According to Twitter, the problem occurred when people using the Twitter for Android app attempted to change settings on their account, like updating their email address. After making those changes, Twitter may automatically disable the “Protect your Tweets” setting.
“Protect your Tweets” setting will allow users to keep their personal tweets private. They say it only affected to people using Android system. The bug didn’t affect people using Twitter on iOS or desktop.
The issue affected Android users who made changes to their account between November 3rd, 2014 and January 14th, 2019. Twitter said it has reached out to users who it knows has been affected by the bug, but the company recommends users who want to keep their tweets private double-check their settings to make sure the “Protect your Tweets” is enabled.