Selfies are so popular, Apple built an entire app collection in the AppStore for it. Selfies are a way to preserve memories when your having a good time with friends but selfies can be dangerous for your health.
A California lice expert, Marcy McQuillan, told the SFist (link) "I've seen a huge increase of lice in teens this year," . "Typically it's younger children I treat, because they're at higher risk for head-to-head contact. But now, teens are sticking their heads together every day to take cell phone pics."