The news follows a much bigger announcement made Monday: namely, that Facebook has received $450 million in a new round of funding from Goldman Sachs and $50 million from Russian investment firm Digital Sky Technologies.
Photos is arguably Facebook's most popular feature, and one that the social network has improved through a number of product updates this year.
Most notably, Facebook began displaying "related photos" on a right-hand sidebar to encourage further photo exploration (and page views) in May, and in late September, users were able to upload high-resolution photos to the network, as well as view full-size photos in the News Feed. The last major update, released in October, brought drag-and-drop album organization to Photos, one of the most-requested features for the Photos product.