Selfies have become increasingly popular in recent years due to the rise of smartphones and social media. However, some research has found that an obsession with taking selfies can be a sign of narcissism or low self-esteem. While selfies allow people to express themselves, others argue they promote selfishness and focus too much on physical appearance. Guidelines exist for taking flattering selfies to share on social networks, but photos posted to ephemeral apps like Snapchat may not truly disappear as many believe.