NEW YORK (AP) — Television viewers were once called couch potatoes. Many are becoming more active while watching now, judging by the findings in a new report that illustrates the explosive growth in people who watch TV while connected to social media on smartphones and tablets.

The Nielsen company said that one in three people using Twitter in June sent messages at some point about the content of television shows, an increase of 27 percent from only five months earlier. And that was before the Olympics, which was probably the first big event to illustrate the extent of second screen usage.