Greater access to information, more politically narrow-minded

From PsychCentral:

“We tend to look for information that confirms our points of view,” said Ivan Dylko, Ph.D., an assistant professor in the Department of Communication at the University at Buffalo and an expert in political communication and communication technology effects.

“It bolsters self-esteem, helps us effectively cope with political information overload, but on the other hand, it means we’re minimizing exposure to information that challenges us. Technology allows us to customize our online information environment.”

This really isn't new information. Notably Jonathan Haidt has done extensive research on political tribalism, but to the extent that people aren't willing to step outside their comfort zones -- they don't have to -- is a relatively recent phenomenon.