I am getting a weird new look on Facebook every time I click on a photo on my news feed. A light-box pops up instead of th normal redirect to the album page. The only difference in URLS I see is the appended "&theater" to the URL. Is this a bug or are they just doing it for random users?
Facebook tests features among small pools of users to see how they interact with new interfaces. If they receive positive feedback and meet usability benchmarks, they push the change to the entire userbase.<p>Short answer: yes, pretty much.