Twitter-happy journalists of the Times Group have been served a dampener by the organisation's HR head. A circular says they may not use their personal social media handles to comment on news, politics, civic issues or crime unless reported by the Group's official social media handles. Nor can they retweet their own stories unless the official Twitter handle has done so. Nor can they use their own Twitter handles to repost invective or opinions which may be against the laws of the land. Why? Because the personal opinions expressed are apparently hurting the "integrity and credibility" of the Times Network platforms.