Which number in headlines for list articles/blog posts is correlated to the most social shares?

To find out, Venngage examined the performance of 121,333 "listicle" articles/posts from brands and publishers. The researchers analyzed the number of shares each piece garnered on four social networks: Facebook, Pinterest, LinkedIn, and Twitter.

Article headlines that include the number "10" have the most shares, on average, across all four social networks.

Articles headlines that include the number "5" have the second-most shares, on average.