NEW YORK (AP) — AMC’s “Breaking Bad” is the champion of a new television metric: more second-screen activity on Twitter than any other TV series this past season.

The Nielsen company, for the first time, is measuring how many people are reading tweets about particular TV programs the night they are on the air. “Breaking Bad,” the drug-dealing drama starring Bryan Cranston, is the initial champion, with an average of 6 million people seeing tweets during each episode and the three hours both before and after, Nielsen said Monday.