We often feel overwhelmed when we are exposed to a large volume of information. We also rely on secondary knowledge that does not come from any external source. For instance, when you are in a theatre and see everyone hurriedly moving to the exit, you are likely to do the same even if you lack the knowledge of the situation.
To put it another way: rightly or wrongly, we think what other people think.
The digital culture has taken this reliance on social information to a new level, with new sets of hazards, anxieties, manipulation and influence.