When I browsed to the Ars front page from my desktop PC (Win 7 Home Premium 64-bit, Firefox 17.0.1), the layout had toggled from three-column to two-column. I didn't do that, it just came up that way.

Facebook tinkers with its design from time to time, but this is a pretty radical departure from the site's previous appearance. In addition to the column change, the content on pages appears less ...