https://phys.org/news/2018-11-latest-facebook-controversy-sandberg.html

Facebook acknowledged Thursday that Sandberg asked her staff to conduct research on the Hungarian-born billionaire following his remarks early this year, out of concern that he held a "short" position that would profit from a decline in shares.

"Mr. Soros is a prominent investor and we looked into his investments and trading activity related to Facebook," a spokeswoman said, queried by AFP after a New York Times report on the matter.