Social Facilitation: the idea that we tend to perform better when other people are watching us.
At all of my swim meets- when my friends were there watching me I performed better.
All through high school I swam on the swim team. As I reviewed my scores from the season- I realized that the meets where my friends were present- I performed better. This is an example of social facilitation because I used the presence of my friends as motivation for me to push myself harder and thus my performance was better than when my friends were not at my meet.