when friends said "use whatsapp to talk to us"
Looked at the access the app wanted
Camera(these are understandable)
In other words... upload the contents of your phone to FB for them to look through and steal the juicy bits worth money.
A big fat NOPE appeared in front of me.... hence only trusted friends get my mobile number
Oh and a buffer overflow attack???? hell clock cycles are cheap... do the check as the buffer fills guys... sheesh