We are all connected by six degrees of separation:

• Every person in this world is connected to the other person by one person or another. 
• In this whole world we cannot try to find a person whom we cannot connect to through fewer than five intermediaries. 
• In other words you are connected to any one on this world in just 6 steps.
• Watch the video for more details.

Source: Are We Really All Connected by Just Six Degrees of Separation?