[zavulon]

I think you can interpret "like you" in a few different ways. Someone can be "like you" if they share common values, even if they have completely different background, interests, personalities, etc.

I don't want to speak for him, but I believe Sam's point is that those are the people that you forge the strongest bond with.

[DelaneyM]

I agree that's a better interpretation, but this is a post for an audience to whom that's not necessarily the most obvious way to read it.

I'd hypothesize that diversity is both among the best qualities to have in one's tribe and something which requires the most intentional approach to assemble. That's well worth pointing out, and probably a more helpful reminder than "make some friends".