"The union and interaction of individuals is based upon mutual glances. This is perhaps the most direct and purest reciprocity which exists anywhere." - Georg Simmel
Eye contact is a major component of effective communication. Frequent eye contact in a conversation indicates that we are paying attention and understand what the other person is saying. Many cultures have different standards for the frequency and duration of eye contact, but people of all cultures rely on eye contact to connect to each other.

eContact: Eye contact for video chat »