They all ask for permission and most people just tick the box. Linkedin lets you do the same thing. People give them their passwords to their email accounts wil

They all ask for permission and most people just tick the box. Linkedin lets you do the same thing. People give them their passwords to their email accounts willingly. Looks to me it's a pretty common practice but I'm no expert on social websites. I wouldn't do it but that doesn't matter, there's always plenty of people who will.