A big lolz at the posters who say Trent Reznor is no longer relevant in the world of music. In fact, he's is revolutionizing our access to artists' music as we speak. And this has absolutely nothing to do with the music he makes. Even if you hate his music and think it is garbage, he is a trailblazer of today's music.
First, for his album Year Zero, he was depositing flash drives with new songs on them in European bathrooms during his tour. Not only did these drives have new songs on them, they gave clues to for an Alternative Reality Game (ARG), such as names for websites hidden in code. Even tour t-shirts has codes hidden on them. This was very fun and a completely innovative way to market an album. Most artists just have the record company dump out an album and make posters. However, trent paid for this type of marketing with his very own money - because he cared about the album's listener experience. If he actually just scrapped the ARG, he likely would have made more profit.
Then, he began giving away the multitracks of his songs for free. This encourage amateur, everyday folk, the ability to remix his songs using Garage Band to make them however they wanted. No other artist today does this. Additionally, as someone has pointed out, he has given fans over 400GB of raw HD concert footage (for free), to make their own concert DVDs.
Next, he compiled a huge amount of evidence that greedy record companies are not needed. He successfully aided Saul Williams in selling his album, Niggy Tardust, over the net without a label. He then gave 2 albums away over the net. Ghosts was put out in many different quality versions; from mp3 to limited, autographed box sets for $350. This allowed all type of fans to enjoy his music, regardless of financial standing (something radiohead did not do). 2500 of them were made and they sold out within hours. You do the math to see how much he made just from the box sets alone. He then gave The Slip away for free, with the option of buying a hard copy (for a reasonable price) that had a DVD in it.
The new NIN App is just another innovation (of many) he has done over the last 5 years. Sure, I probably don't want to chat with some random fan in Uganda, but if we are sent other treats (wallpapers, songs, or videos), then sign me up.