(AP Photo/Karly Domb Sadof, File) This Feb. 19, 2014, file photo shows the Facebook app icon on an iPhone in New York. Panic over what children are picking up over the Internet sweep social media on a regular basis. In the most recent, children are purportedly encouraged to complete harmful tasks. Though the so-called Momo challenge is believed to be a hoax, other “challenges” and trends should cause concern.