Section 1. Human motivations behind selfies. Chapter 1. Shameless selfie-promotion: narcissism and its association with selfie-posting behavior ; Chapter 2. Spontaneous taking and posting selfie: reclaiming the lost trust ; Chapter 3. Motivations and positive effects of taking, viewing, and posting different types of selfies on social media: a cross-national comparison -- Section 2. Socio-cultural aspects of selfie-taking and selfie-sharing. Chapter 4. Selfies: new visual culture of new digital society ; Chapter 5. Self-objectification vs. African conservative features in the selfies of black African women: a study of Nigerian social media users ; Chapter 6. Work-based self-portrayals: signaling reciprocity on social media to reassure distant work-based project collaborators -- Section 3. Formalizing the analysis of selfies. Chapter 7. Creating an instrument for the manual coding and exploration of group selfies on the social web ; Chapter 8. Senses of "selfie" around the world from web search patterns over extended time.