Sending Out an SOSby Geoff LivingstonMarch 14, 2015 Sending Out an SOS: This homeless man was scribbling furiously, oblivious to the world around him. And the world around him — Austin, TX — was in the throes of SXSW. He was invisible to most, but not to me. Tags:homelessinvisiblepeoplescribblingSocial MediaSOSworld