You've probably seen this image floating around Twitter and Facebook:

Something about this didn't seem right because no information about the victims has been released other than that one of the victims was an 8 year old boy,  so I did a little digging around and here's what I found:

The photo of the girl in the picture above was retweeted nearly 40,000 times yesterday alone, but according to Twitchy:

No, this is not a photo of the Boston Marathon. It was taken at a 5K held last May to raise money for families of sick children. A team of Newtown parents did run the marathon, but all were reported safe, having finished the race before the blasts occurred. And the child killed was reported to have been a boy, not a girl.