7 Scientifically Proven Ways To Get "Shared" On Facebook

These days, sharing isn't just caring--it's ensuring virality, especially on Facebook. And Dan Zarrella, the Hubspot viral-marketing scientist who gave us nine proven ways to get retweeted on Twitter, knows exactly how to encourage it.

For several weeks, he compiled roughly 12,000 articles posted to Facebook, most from big-name sites such as Mashable and CNN. Then, he found the average number of times each was "shared"--meaning it was commented on, liked, or directed to a friend--and...