The 'social psychology' was quite extensive topic but later on, the bystander effect comes up on my mind. I've seen Tv program about this. Bystander effects are quite common experiments. Some of us might experienced or heard it by chance and it might help us to understand.
Bystander effect is the phenomenon that people don't take action when someone is in danger and even more witnesses means less helper.
There are many factors that people help someone in troubled situation we can think about, such as time, personality, and ability and power to help. However, it is very interesting how the number of people around affects on relative frequency of help action. In the article, the experiment of Latan
We often question an individual's motive behind not helping another. Yet, we often find that approaching a helpless stranger on the street is harder than it seems to be. This is because when accompanied by a friend or friends, we tend to consider their views before our personal thoughts. Such bystander effect is not uncommon around us. At work, we sometimes avoid menial tasks, wishing that someone else would do it sooner or later. Our reluctance to carry out an act with our own hands, which is something that defeats the basic social responsibility, cannot be a benefit to our society as a whole.