Small worlds and six degrees of separation
Social networks are remarkably small, in the sense that you can hop between any two individuals in them using only a few hops. This video explains what such small-world networks are, why social networks are so small.
Influence in complex networks
Friends influence each other in their opinion of many aspects of life. In this video we describe how the level of connectedness in a social network relates to the extent in which individuals in it influence each other.
Complex networks
Many aspects in our daily life can be displayed as a network consisting of elements and the connections between them. This is explained in a playful manner in this video.