I have already written how some people can pass their ideas to us and although we will reject these ideas at first, in the end, we accept them under the social "pressure". Here's an experiment on how society can influence our choices and our opinions.
Solomon Asch, an American psychologist, pioneer in social psychology, made an experiment known as "Asch Paradigm". He put in a room a few random people with one of them was the subject (in the first video below, is the one with the white shirt, while in the second video is the one with the red shirt) and everyone else was with the researcher's team, so they were telling the numbers matching with the lines they saw in various cards.
In the experiment, these guys are sometimes saying the correct and sometimes the wrong answer. The subject wants to say what he sees and of course what is the correct answer, but finally he "forced" to say what the most people saying.
The conclusion of Solomon Asch was that while most people do not adhere to something wrong, they accepting it as correct when surrounded by people who all agree with the wrong answer.
In a variation of the experiment, Asch asked the subject to write his answers instead of saying them in front of the others. Asch noted that the subject answered in all the tests correctly, concluding that when the others did not see what he was writing, there was less "pressure" in his answers.
This experiment of Asch shows us that people denied their own eyes when they are influenced by others and they also fearing the social "exclusion" or rejection if they go "against" the others or do not do what everyone else does. This is called "regulatory compliance" (or normative social influence) and a big example is the smoking or the drug use, because it's something our friends do and someone will be "uncool" if he do not do it too. And of course, it's something you can see in social media.
Watch in the following videos how our decisions can be affected by others.