Mistakes were made, and now they're being corrected. Back in May, Twitter changed its default web font from the widely-loved Helvetica Neue to the somewhat blockier font Gotham, and people were unhappy with the change, to say the least. Twitter is now going back on that, replacing Gotham with Helvetica Neue once again, which Twitter says is a better choice for "speed and readability." It's a much improved look, so we can all breathe a sigh of relief and go back to browsing twitter.com comfortably again.