Seems like the Facebook train just keeps on rolling, with todays news that the Lightbox team will be joining the social network. For Lightbox users, the end is sadly nigh as the service will be closing down completely from June 15. Existing users can continue to use the service until then, but no more new signups will be accepted.
This isn't an acquisition, not like the $1 billion buyout submitted for Instagram. As such, none of the user data stored by Lightbox will become the property of Facebook. The staff is the only part transitioning, and as such closing the doors for good. Until June 15, all your photos can be exported, and the Android application has already been removed from Google Play. Additionally, parts of the code will be open-sourced in the coming weeks.
Source: Lightbox Blog; thanks @FYeahRyanRocks for the tip!