Are you speculating this figure because thats what the TechCrunch article that broke the story said, or do you have alternative sources of information? No disrespect, just wondering.
From his personal bio: "Frank was formerly a product strategist and evangelist for the Aol social networking group, which included such products as AIM" and I'm assuming FrankGruber5 here == @Frankgruber on Twitter who lists "Frankgruber5" as a link to about him.