HT to Chris for reminding me: Shot at Life had this cool idea - they are running Blogust:
Blogust is a first-of-its-kind blog relay for good that is bringing together 31 of the most influential online voices in the country to change the world through blogging. Each day throughout the month of August, one influencer will post about someone that inspires them and then “pass the baton” to another blogger for the following day. The twist is this: every comment on a Blogust post will initiate a $20 donation to help immunize a child in a developing country.
Your pro-vaccine comment will save a life, but, what is even better, "their" anti-vaccine comment will save a life (by vaccination) as well. So check out their calendar and stir up the discussion.