Regarding all the comments about people going to the grave and placing mementos, etc and taking pictures. I think it's a little weird for strangers to bring their kids and then take pictures and post on Facebook. But, they probably mean well. Since it doesn't appear Noah's family is looking out for him (I would have thought somebody would have intervened if he was living in a neglectful environment with drugs - my opinion only), I think it's nice Tabitha and Dawn (the admins from the FB pages) have kind of adopted his gravesite. But it does appear to be getting a little weird.
With that said, I wish people would take the stance of "paying it forward" instead of buying flowers and trinkets for strangers' graves/memorial sites when they die. My oldest son's birthday is close to Christmas. When he died as a young child, every year at Christmas I take a tag off an "Angel Tree" at the local mall and buy a toy for a boy his age (the age he would have been at that time). But paying it forward doesn't have to be monetary either - just doing a random act of kindness in the person's honor. And with Social Media, if people see the need to have it publicized, honor the person that way (i.e. "I shoveled Mrs. Davis' walkway #neverforgetNoah"). I think that has a more meaningful effect than a cluttered gravesite.