Meaning, in part, that if a study drills down on a particular demographic or relates to something its users would consider "deeply personal" (i.e. feelings or moods), before the research begins it has to go through what Facebook CTO Mike Schroepfer calls an advanced review process. That review process will be handled by senior-level employees from the social behemoth's engineering, research, legal and privacy-and-policy teams.
Every employee regardless of position will undergo a bit of learning on the research process during the outfit's six-week training seminar, too. But wait, there's more! Facebook has also setup a portal that hosts its research projects for all to see. From here, at least, it looks like the company is keeping its promise to not repeat the same mistake twice.