Are you talking about (a) completely hiding low-karma posts, or (b) "minimizing" the text of those low-karma posts in a way similar to how the example works? I

Are you talking about (a) completely hiding low-karma posts, or (b) "minimizing" the text of those low-karma posts in a way similar to how the example works? If it's (a), that's basically what sites like Slashdot and Reddit already do for desktop users. If it's (b), the obvious question is how you algorithmically filter text to only include the pertinent information (the given example is almost certainly hard-coded), which doesn't sound like a simple question to answer.