“That’s a big number even by Google standards,” said Google social czar Vic Gundotra while talking with Sergei Brin and John Battelle onstage at Web 2.0 Summit.

While the number had already been buried in the Google earnings call last week, Gundotra emphasized onstage that the stat “Blew his mind.”

Gundotra seemed genuinely impressed by the number crediting the fact that photos can be automatically uploaded to Google+ from Android phones — So is a user engagement number really a user engagement number if users don’t actually have to be engaged to use the feature?

Eh hem.