Is Facebook suppressing views of free posts?

I recently tried a little experiment. I paid Facebook $7 to promote my column to my friends using the company’s sponsored advertising tool.

To my surprise, I saw a 1,000 percent increase in the interaction on a link I posted, which had 130 likes and 30 reshares in just a few hours. It seems as if Facebook is not only promoting my links on news feeds when I pay for them, but also possibly suppressing the ones I do not pay for.

Disruptions: As User Interaction on Facebook Drops, Sharing Comes at a Cost,”  by Nick Bilton, New York Times.