Anti-vaccine moms should really stay away from Facebook:

[The] group is called “Find a Pox Party in Your Area.” According to the group’s page, it is geared toward “parents who want their children to obtain natural immunity for the chicken pox.”

On the page, parents post where they live and ask if anyone with a child who has the chicken pox would be willing to send saliva, infected lollipops or clothing through the mail. Parents also use the page to set up play dates with children who currently have chicken pox. Medical experts say the most troubling part of this is parents are taking pathogens from complete strangers and deliberately infecting their children. One concern is that they are sending the virus through the mail. A Facebook post reads, “I got a Pox Package in mail just moments ago. I have two lollipops and a wet rag and spit.” Another woman warns, “This is a federal offense to intentionally mail a contagion.”