New Delhi, July 31 -- An 18-year-old man was stabbed to death, and his friend left injured after a group of 10-12 teenagers attacked them over a social media comment in outer Delhi's Paschim Vihar West on Wednesday, police said on Thursday. Police have registered a murder case and detained two suspects in connection with the case. The deceased, Kartik Singh, was a resident of Jwalapuri Camp. Police said, according to initial probe, he had previously fought with a group of boys from Meera Bagh JJ colony area and last week, allegedly made a comment teasing one of the members of the group. On Wednesday morning, police said Kartik and his friend, Aniket, got into an argument with the group that was leaving for the Kanwar Yatra. "The argument qu...