The buffet analogy is interesting, but flawed in the sense that:
1. your selections don't radically change what the buffet offers in real time like, say, Google search.
and
2. Unless you take pains to anonymize, your buffet options are already skewed to support your biases, say to starches.
My wife and I will research the same topic at the same time on our respective workstations and get radically different results. The internet echo chamber feeds back two very different experiences, side by side (Never mind what happens when I fire up a non-US VPN)
One of us adds a single negative keyword to their search phrase and the results are dishearteningly dystopic. Coworkers who rely on Facebook for their daily dose of tribal information have an extremely different set of 'facts' for any topic I care to mention.
What I find most disturbing about this is that few people can/will take the time to compare notes across tribal or socioeconomic divides in a meaningful way -- we're all consuming a different buffet and its becoming more difficult by the minute to be sure of the chefs and suppliers.