Nicole Ellison of Michigan State University found that the frequency of networking site use correlates with greater self-esteem.

密歇根州立大学的尼科尔·埃里森发现，社交网站的使用频率与自尊心的强弱有正相关。

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The entrepreneurship of the population correlates with bigger acceptance for the wealthy in Poland.

FORBES: Plutocrats Remain Suspect in Much of Post-Communist World

Optimism correlates with resilience, strong coping techniques, and a sense of well-being in times of adversity.

FORBES: How To Use Optimism To Defeat Adversity

So, the steep fall in vandalism correlates with a steep rise in the use of social media.

BBC: The vandals are in their bedrooms