I feel like we are becoming less homogeneous. When I was a kid everyone watched cable television after dinner and everyone watched all of the same shows. Thursday night was Friends. Friday night was Full House and Family Matters, etc. Now I find everyone I know watches all kinds of shows, many of which I've never even heard of. Not to mention YouTube which is whole new layers upon layers of content. In an odd way, I actually kind of miss the "bonding" cable television used to give the populace (but not really).
I just chose shows as an example. But I feel the same happens with reading, music, technology, politics, etc.