I highly doubt it. The new feature they were testing was probably rolled out to a % of their user-base (as any sane company rolling out new features does.) Fac

I highly doubt it. The new feature they were testing was probably rolled out to a % of their user-base (as any sane company rolling out new features does.) Facebook has tools that lets them target experiments to specific subsets of their users. Chances are this experiment targeted 14M users in a very specific geography (generally English speaking users probably in the US/CA/NZ/AU). Most likely, this sounds like a UI bug where users in the experiment had their default "audience" for their posts set to Public, instead of the value that it is usually set to. The UI probably showed that it was being posted to the public, but obviously, if you weren't looking at that you'd probably expect it to have been the same as your previous default.