On average, we can manage to have 500 acquaintances and can remember the faces and names of 1,500 people at the max.

The Dunbar Number is the notion that there exists a cognitive limit on human groups of about 250 individuals.

The "Person-qua-Person factor" is a significant aspect of friendship which states that each friend has significantly different characteristics.

The Cheerleader Effect states that people look more attractive in a group.

Passively using Facebook without physical interaction with your friends creates a negative effect on you and increases your envy.

When people are with their friends, they tend to engage in less riskier activities.

According to a joint study conducted by MIT and Tel Aviv University, all your friends reciprocate your feelings.

Kids as young as three to six years old are able to understand the values and characteristics in friendship.

You could still feel lonely, even though you have a lot of friends.