young teens. it sent facebook stocks plunging in after hours trading. those are some of our top stories on this halloween, thursday, october 31st. > . >> announcer: from abc news, this is world news now with john muller and diana perez. >> happy halloween, everybody. >> happy halloween. >> ready to get your candy on? >> i really am. i have a couple of little props here. >> nicely done. >> my boa. >> go to our facebook, wnnfans.com and you'll see us in costume. >> yes. you'll be able to figure out what we were today. >> should we get to it? >> let's get to it. >> we'll begin this half hour with the nsa strongly denying two new reports about spying activities. it's knocking an italian report that it spied on the cardinals at the vatican when it picked a pope. the nsa said it did not tap