Although each status update is a discrete element, so it's not as if the dual column layout really matters. I mean, you're not reading a book-- it's more likel

Although each status update is a discrete element, so it's not as if the dual column layout really matters. I mean, you're not reading a book-- it's more likely you'll read a status update and then expand and read the comments directly below it rather than reading a large number of statuses in a row. The news feed is still in a single-column format because you might actually read quite a few in a row of those. At any rate these extensions seem like an exercise in futility as Facebook will surely completely remove the non-timeline functionality sooner or later.