Typical advice for forming a glowing first impression goes like this: Shoulders back, look confident, flash a smile, listen twice as much as you talk. But when social interactions take place in a cyber world, how does your personality shine through the screen?Like with conventional first impressions, there’s no right way to present yourself—it’s what suits your style. Yet today, social networking sites serve specific, diverse purposes—from staying in touch with friends to finding romance or a job. Social networking sites are no longer just a passing time for the young. With an estimated 700 million online profiles worldwide, each one can make a lasting impression on your identity.Simply put, establishing your online presence is an art form. Think: who is going to see your digital self? (Potentially everyone.) And what message do you want to send to them?