Atlanta -  Kik Messenger, a smartphone app popular among younger teens, is on the defensive following the stabbing death of a 13-year-old girl in Virginia who told friends she was using Kik to connect with an 18-year-old man.

Like Instagram, Snapchat and other messaging rivals, Kik provides free, easy and instant connections to other users anywhere. Kik enables people to message each other one-on-one or in group chats, and to share photos, videos and other content. By enabling people to identify themselves only by an invented username, it provides more anonymity than services such as WhatsApp, which connect people through their phone numbers.

Law enforcement officials say the application is dangerous in part because parents cannot reliably prevent anonymous strangers from contacting their children if they use it.

Kik made an updated guide for parents available on its website following the arrests of two Virginia Tech students in the slaying of Nicole Lovell, a seventh-grader who lived two miles from their campus in Blacksburg, Virginia.... Read More: VIN