A former Milwaukee County sheriff was put in read-only mode by Twitter until he deleted three of his tweets seeming to call for violence against the media. David A. Clarke Junior had been blocked for violating Twitter’s terms of service.  After deleting the tweets, he insisted he won’t be intimidated into silence by what he calls the “lying liberal media.”  Twitter rules ban users from making specific threats of violence, or calls for the serious physical harm or death of an individual or group of people.