According to big data, the Web is making us less open-minded

The modern Web is often lauded for the way it has democratized communications and provided a platform through which individuals can influence and reach a mass audience, without gatekeepers like the traditional media.
The reality, however, may be somewhat different, according to Dan Wagner, founder of analytics firm Civis and former chief analytics officer on the 2012 Obama campaign.
Wagner began his SXSW talk by explaining why political campaigning has led the