Um Im not denying the memetic power of social networking but advertising shapes nearly everything in our lives. Like why does anyone give a shit if coke is better than pepsi when they taste nothing alike. And even when you rebel against the adverts somebody profits over it.

But you know what we don't even need to talk about that.

What your thread is railing against is just circlejerks isn't it. The amount of "echoes" an echo chamber produces is just that much more now that you can agree with a single click. Of course it's not healthy for critical thinking. Did you expect anyone to disagree there?