I'm pretty sure Mastodon is the first social network I've been on that didn't immediately ask me to betray all of the people in my address book.
I mean, think about this for just a sec: LinkedIn, Twitter, SnapChat, Instagram, the list goes on and on. The VERY first thing these platforms will do after you've installed the app and logged in is to ask you to share all of the information in your address book. Ever wonder how these social networks got so big so fast? It's remarkable how much of their growth is based on convincing everyone it's totally fine and normal to give away all of the contact information given to them by friends, family and acquaintances.
@briankrebs and how many people say “yes” to sharing that information without a thought.

@fsinn @briankrebs I accidentally answered yes for LinkedIn. I wanted to see who in my adress book had linkedin accounts, but what happened instead was that they sent a contact request to every single person in my address book.

I think they got sued for that thing later.