Humans’ cognitive abilities are subject to various biases both at the individual and collective levels. Such biases can have dramatic effects on our decision making. The rise of social media, crowd-sourced information repositories, and user-based information channels have raised the concern that “fake [or biased] information” along with “filter bubbles” will further distort the perception of reality that online users gain through online media leading to ill-informed decisions in political events and beyond. The proposed research aims to study and quantify two main processes in which such biases can be induced and affect our judgments, through a series of large scale field experiments. In particular we will focus on anchoring effect, that is irrational reliance on the provided numerical information, even unrelated, when making decision.