Few things as creepy as joining a new app, seeing a big list of people you know in the “suggestions” list, and realising that scumbag devs know who you are and who you hang out with, just because they conned someone into clicking a “connect with friends” contact-upload button

I'll upload mine *if* I'm confident I can then delete them and have it not remember them all. Which I should probably be less confident about to be honest.