Granovetter’s 1973 article, “The Strength of Weak Ties,” introduced whole new ways of thinking about seemingly simple and straightforward topics and changed the direction of social research. He showed how “weak” ties, occasional connections between individuals among different networks, were powerful means for providing opportunities and new ideas not otherwise available. He also charted a way for researchers to connect micro-level interactions with macro-level patterns. The article was very successful, and whole new fields of study on social networks has emerged as a result.