There is a couple of points I disagree with this article. First off two factor authentication and resetting your account use sms's for recovery not so much to

There is a couple of points I disagree with this article. First off two factor authentication and resetting your account use sms's for recovery not so much to get access to your social graph and thereby "growth hacking", but because proving someone's identity you don't know personally digitally is a hard unsolved problem (pgp key ceremonies and web of trust certainly didn't solve it). Second, saying you should use end to end encryption doesn't prevent someone from resetting your account and getting access, so it is not some sort of silver bullet. It does however prevent an attacker from reading your past messages, but after getting access they will be able to read all your current messages on multi device services.