Henio Zytomirski’s Facebook profile picture stands out from most. The grinning 6-year-old is captured in black and white and poses in an old-fashioned buttoned-up shirt and shorts. The photograph, shot in 1939, is probably the last taken of him before he was murdered in the Holocaust. A group in the boy’s hometown of Lublin is using the social networking site to breathe virtual life into Henio’s stolen childhood and give people around the world the chance to get to know him — as well as mourn the millions of others killed by Nazi Germany.