Given Facebook's current size, and how many people are relatively disgruntled, but work there because of the pay being quite good, the chances of leaks for wide coms approach 100%. The level of internal, upward trust you need to have few leaks left facebook at least 10 years ago.

No amount of hate will fix it, and no amount of tracking will hide all but the most hidden secrets, so he better get over it. In his situation, hating leakers is like Garfield hating Mondays.