User blog comment:IamJakuhoRaikoben/Chapter 418: Challenger, Review./@comment-25111584-20150202144931/@comment-1359322-20150202150527

I think Lucy was gathering infos on her friends only, you can see it in her wall, it's all FT members only. So i don't think Natsu or anyone can use that info so randomly, plus if Zeref or CS were so easy to find, no one would have to face so much trouble.