My info wasn't leaked-- if it had been, I'm not sure if it would tell you how it was leaked (wether it was you who gave access to "This Is Your Digital Life" or a friend).

If you're actually very curious, all I can think of is you could ask your friends if any of them had their info leaked, and if it was through themselves or a common friend. If you're friends with anyone who gave access to the app, you're part of the bunch.

They should still be able to email people even if they deleted. It's the least they could do.