Here's some more detail:What do CEO Mark Zuckerberg and COO Sheryl Sandberg know and what will they discover? The problem comes down to whether other apps shared masses of information about Facebook users. Implicit in that statement is that Facebook doesn't know what access to data other apps had had over the past few years. If it looks like either will leave the company then expect heightened worries over who fills the void. If the recent scandal causes facebook members to quit the site in droves, it could be a problem for the company and therefore a problem for shareholders.

Source: Forbes March 23, 2018 13:07 UTC