[prvc]

Maybe so, but not necessarily true a priori.

[titanomachy]

Statistically speaking it’s probably true. The fact that you’re friends with them is evidence that they have friends.

See “friendship paradox”: https://en.m.wikipedia.org/wiki/Friendship_paradox

[prvc]

>On average, the people you know are more socially successful than the people you don't know.

It depends if "you" refers to a specific person, which it seems to do in context.

[lazide]

Not really. The folks no one knows are the most successfully ‘non-social’, by definition no?

And by definition, the ones with fewer friends also are known by fewer people.

[BurningFrog]

Some people don't have a single friend.

None of them are in your friend group.