It’s sad that a horror like the Boston Marathon bombing brings out the bad guys. Avoid charity scams claiming to raise money for the families of the dead and injured. Read the NYCOTC article on avoiding charity scams we published immediately after Hurricane Sandy.
Donate to the Boston One fund, established by Massachussetts Governor Deval Patrick and Boston Mayor Tom Menino. We know that charity is legit.
Make sure your donations support legitimate charities, not scammers who prey on those who want to help victims. My go to source for information on legitimate charities is Charity Navigator, which reviews and rates thousands of charities.