A tweet from Rep. Marsha Blackburn (R-TN) that mentioned Planned Parenthood’s sales of aborted baby parts led to Twitter blocking a campaign ad in her bid for a US Senate seat in her state. Twitter CEO Jack Dorsey labeled Blackburn’s tweet “inflammatory and likely to evoke a strong negative reaction. On the one hand, there’s the woman who already has to deal with the emotionally difficult decision to terminate her pregnancy. Awareness that her baby might be cannibalized and sold for parts like a junked car would add unnecessary trauma to that decision.” “On the other hand, there is potential...