Heres a report from Times of India that says all about this fake app. Sorry for posting it!
Scam: 'See who viewed your Facebook profile'!
Many of us are quite curious to know who viewed our Facebook profile. However, unfortunately scammers too are aware of this, and use the lure of such functionality as a way to trick users.
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According to security firm Sophos, "Messages spreading rapidly across the Facebook social network right now say: OMG OMG OMG... I can't believe this actually works! Now you really can see who viewed your profile!"
In fact, so far there is no application or way to find out who viewed your facebook profile. This means all those applications that promise you to show who has viewed your Facebook profile pages are actually scams.
Sophos warns that scams like these are used to earn commission for the mischief makers behind them, who have no qualms about using your Facebook profile to spread their spammy links even further.
However, in case, you've already fallen to the scam like this, remove references to it from your newsfeed, and revoke the right of rogue applications to access your profile via Account/ Privacy Settings/ Applications and Websites.