Nielsen is a long-established player in the audience metrics field, covering marketing and consumer information, television and other media measurements including online and mobile. So it comes as little surprise that Nielsen is now expanding its digital measurement scope into online TV content. The pilot program kicks off at the start of May and will continue through to July, with big-name brands such as A+E, ABC, AOL, CBS, FOX, NBC and more participating in the trial of the new Nielsen Digital Program Ratings, which is setting out to measure digital audiences for online programming. Nielsen, of course, isn’t new to the online TV realm. Back in December, we reported on the new Nielsen Twitter TV Rating system, which effectively made Twitter the first purely social ranking of TV program popularity in the US. It recently made this tool available in the UK and Japan too.