Mark Granovetter's foundational discovery — that weak ties, not strong ones, are the primary
conduits for new opportunities — is now one of the most replicated findings in social science.
Raj Chetty's team confirmed it at planetary scale: analyzing 21 billion Facebook friendships, they found that
cross-class connection is the single strongest predictor of upward economic mobility —
stronger than school quality, family structure, or local job markets.
But here's the cruel irony: every social platform we've built optimizes for homophily —
connecting you with people like you. Recommendation algorithms maximize engagement by reinforcing existing
patterns. The connections with the highest cooperative potential — the cross-boundary, complementary,
unexpected ones — are systematically filtered out by the systems designed to "connect" us.
The most valuable connections in your community are the ones that would never appear in your feed, your search results, or your social graph. They exist in the space between networks — and nothing is designed to find them.
Granovetter 1973; Rajkumar et al., Science 2022; Chetty et al., Nature 2022; McPherson et al. 2001