Paul KedroskyThe current wave of polarization in developed economies more or less began with mass adoption of the Internet, then reached escape velocity with the rise of social media.
TiTiNoNero 
@paul it seems more like a correlation.
You can't prove causality, of course, but I'm not the first to point out the relationshp and its plausible mechanisms.
@paul Yep, but causal factors may be hundreds and well hidden until a model is proposed.
It is definitely over-determined, but it would be startling and historically unusual if connective technologies hadn't played a significant role.