Thursday 12 December 2013: Twitter introduced, and later in the day withdrew, a change to its "blocking" policy after users protested the change. © 2013 Reciprocity Images News

- Image ID: DMKH3E
Thursday 12 December 2013: Twitter introduced, and later in the day withdrew, a change to its "blocking" policy after users protested the change. © 2013 Reciprocity Images News
Reciprocity Images News / Alamy Stock Photo
Image ID: DMKH3E