I actually commend BuzzFeed for having unabashedly liberal social viewpoints. So maybe through listicles and what not, it can help push for more openness in our society to heterogeneity.
That sounds more like Upworthy, which was founded by two former leaders of MoveOn.org (Eli Pariser and Peter Koechley) with the explicit goal of presenting liberal/progressive ideas in viral, shareable packages. (See http://www.nytimes.com/2013/10/14/business/media/upworthys-v... for more background on this.)