3 of my running buddies were running the Marathon yesterday. I was watching it live on the internet and tracking their progress during their runs via electronic chip timing. They had all finished more than an hour before the bombings but 1 of them was still near the finish line with their family when the bombs went off. Cell phones were not working in that area either due to overloading or perhaps due to cell phone service being turned off to prevent other bombs being detonated via cell phone.  With FB I was able to verify all three runners and their families were safe within an hour after the bombings..