LOS ANGELES (AP) — Comcast Corp. and its NBCUniversal subsidiary are taking a stake in zeebox, the maker of a so-called "second screen" app that people can fiddle with on mobile devices while they watch TV.

The cable giant isn't saying how much it's putting into the company, but executives said that starting next month it will start advertising how zeebox will be integrated into its shows.

The app gives users information about people and products that appear in shows, allows users to see what their Facebook friends are watching and points users to iTunes so they can buy songs that come up during singing shows such as NBC's "The Voice."