Police: 'Game of 72' Challenges Teens To Disappear

FRANCE--A Facebook game is spreading panic among parents in France. 

Police say the dare is called "Game of 72" and involves teenagers challenging others to disappear without word to their families for 12, 24 or 72 hours. Authorities found out about the game after a 13-year-old girl from France went missing for 3 days last week. 

The girl turned up safe but refused to tell police or her parents. where she was..saying only she had completed the "Game of 72" dare.