From a story in Nature on the SSRC’s mostly stalled Facebook research program:

But issues with the data quickly emerged: Facebook has been able to share some information with researchers, but providing them with more sensitive and detailed data without compromising user privacy proved technically more difficult than the project’s organizers expected.

The whole Nature piece is far too credulous. Facebook lies, delays, obstructs, and then lies some more–and has long used its internal research unit as a PR sidekick. Protecting user privacy is the last thing on Facebook’s mind.