https://techcrunch.com/2017/09/15/report-facebook-gave-special-investigator-robert-mueller-detailed-info-on-russian-ad-buys/

An official for Facebook told TechCrunch that the company is “continuing to cooperate with the relevant U.S. authorities,” as investigations into the Russian hack of last year’s presidential election continue to expand. In the latest development, authorities are now investigating how agents used online advertising on social networks and search platforms, and tech companies are being forced to hand over new, sensitive information to investigators as a result.

In some cases, that means providing different information to different investigations, as The Wall Street Journal is reporting today.