Reports indicate that Facebook removed thousands of posts which were shared during the 2016 elections. These posts were linked to Russian accounts after a Columbia University social-media researcher named Jon Albright  used the data to further examine what kind of reach Russia had on social media. Facebook has blamed the deleted data on a glitch within their analytics software. 
Facebook then blocked Jon Albright from viewing certain pages.
Albright told the Post that Facebook said the information wasn’t meant to be public, and that the company considered it a “bug” that he was able to find and download the data through the Facebook-owned social media analysis tool CrowdTangle. 
- ir.net, October 13, 2017, Chase Sanders – Twitter & Facebook Deleted Crucial Russian Posts Before Investigators Could See Them
- Research Director at the Tow Center for Digital Journalism at Columbia University
- cnet.com, October 12, 2017, Laura Hautala – Facebook blocks researcher from viewing Russia-affiliated posts
The researcher had looked at the information to study the reach of ads associated with an alleged Kremlin-backed campaign.