Sorry, but this is absolute nonsense, something all too common with these friend-of-a-friend type stories. Unless he was interviewing with several different groups and getting rejected a bunch of times, there's no way he would have that many interviews.
Those who got those counters were top contributers who had often been neglected by Google's compensational and promotional structure. Most Googlers are not good enough to work for Facebook.
The vast, vast majority of these applicants have no shot of working for Google, much less of being then poached by Facebook.