Today I saw a Facebook posting that reminded me of the 1980s and the 1640s. The posting was one of many ill-informed, potentially fake and hate-filled railings against parents who have made a medical or religious decision not to vaccinate their child with the Measles, Mumps, Rubella (MMR) vaccine.  This particular posting suggested that unvaccinated children should wear a skull and crossbones marking to identify them as unvaccinated.