 It's Monday, December 17th, 2012. I'm David Pierce, and this is the world according to me. It's 90 seconds on the verge. Surprise, surprise, the highly anticipated Google Maps for iPhone is highly popular. Google senior vice president Jeff Huber announced the Maps app has surpassed 10 million downloads in just 48 hours. It's currently the number one free app in nearly 50 countries on the iOS app store. None of this is surprising, of course. The worst Apple Maps stories have also served as the best Google Maps advertising. TV ratings powerhouse Nielsen has found a new bedfellow in Twitter. The so-called Nielsen Twitter TV rating will be available starting with the fall 2013 TV season and will measure engagement data. The new rating will go hand in hand with Nielsen's current system and will help advertisers figure out not only who's watching a show, but what they're saying about it while they watch. As for what people actually use the data for, that remains to be seen. One thing's for sure, though. The revolution will be hashtagged. And by revolution, we mean the show on NBC. And finally, before its billion-dollar marriage to Facebook, Instagram had actually agreed to sell out of Twitter for $525 million. That's according to The New York Times, which reports that Twitter even handed Instagram a term sheet during negotiations before CEO Kevin Systrom and company decided to, quote, remain independent. This revelation could anger investors who may no longer be convinced that the Facebook deal was made with their best interests in mind. The New York Times also says there might be perjury risks for Systrom, who claimed under oath that Instagram had never received any formal offers. And that's it for today's top stories. Coming up tomorrow, new revelations on why two probes crashed into the moon, plus what we found among the wreckage.