Self-presentation:

• Online identity expression (avatars, signatures, personal pictures) - Use of these artifacts influences the user’s sense of social presence (Shen, 2009)
• Self-disclosure positively impacts user engagement

Extroversion:

• Extroverted personalities can be displayed through text, animation, and voice.
• Human warmth and sociability affect social presence (Short et al., 1976)
• Extroversion is more socially perceived by students