In the wake of the Monday afternoon explosions, there are several ways you can check on friends and loved ones who may be in and around the Boston Marathon.
Google Person Finder: http://google.org/personfinder/2013-boston-explosions
Boston Marathon Race Day Athlete Check in: http://raceday.baa.org/individual.html
American Red Cross Safe and Well Listings: http://www.redcross.org/find-help/contact-family/register-safe-listing
Where you can find more information:
The Boston Marathon's Facebook page is providing updates, including where to meet family members in the wake of the explosions: Boston Common.
The Boston Marathon on Facebook: https://www.facebook.com/TheBostonMarathon
The Boston Police Department is using its Twitter feed to provide updates about safety and police activities in the wake of the explosions. You can follow @BostonP_Police here: https://twitter.com/Boston_Police