The Pew Research Center has put its finger on a Facebook paradox.

Some 20 to 30 percent of Facebook users are “power users,” according to a study by the Pew’s Internet & American Life Project, done in collaboration with Facebook. This is the minority that partakes of at least one Facebook activity at a “much higher rate” than the rest of us. (About 5 percent do everything you can do on Facebook at a much higher rate.)

The result, says “Why most Facebook users get more than they give,” which was released Friday, is the oddity expressed in the report’s title. “The average Facebook user receives friend requests, receives personal messages, is tagged in photos, and receives feedback in terms of ‘likes’ at a higher frequency than they contribute.”