Those "audits" will be toothless, and the only effect we'll ever see from them is the occasional headline. Read up on Microsoft since the late 90s or IBM since the early 80s, among many others.
The FTC's presence in FB's business decisions will only lend an air of legitimacy to what would otherwise cause problems with their users, and transforms FB's business model from "users are dumb fucks" to "Mom said I could."