Rayzer dear...  Meh!  :((((

   [1]http://venturebeat.com/2016/08/02/hackers-break-into-telegram-reveal
   ing-15-million-users-phone-numbers

   [2]https://telegram.org/blog/15million-reuters

   PS:  -  Sorry, still late!  :P

   (And if you are boring and invasive, I certainly will be late forever!
   Give up, baby!)

References

   1. http://venturebeat.com/2016/08/02/hackers-break-into-telegram-revealing-15-million-users-phone-numbers
   2. https://telegram.org/blog/15million-reuters