Frequency is a funny thing. You know it when you see it, it goes "click". You can usually tell similar frequencies by (a) the economy of words (b) common bases of thinking about the world; and (c) shared humour. Interestingly (a) then leads to the proliferation of conversation, (b) provides the safe ground on which to spar and challenge each other's ideas, and (c) ... well (c) just makes you laugh a lot together, which gets people through the not-so-similarly-frequent parts.