Twitter said this was designed to protect victims of harassment who feared that blocking a user would lead to retaliation.
But after a wave of online protest, Twitter re-instated its previous policy, whereby blocked users are notified, and are prevented from following and interacting with their blocker.
Michael Sippey, vice president of product at Twitter, said: “We have decided to revert the change after receiving feedback from many users — we never want to introduce features at the cost of users feeling less safe.”
Several online petitions had been launched and users rallied behind the hashtag to complain about the change.