Facebook, selling new app, weird?

[Jimmy]

Someone I had friended posted a link saying, finally I can track my hits on Facebook. I thought it would be cool so checked out the link. It said I allow this app, unrecieved must add, to post images, video, and messages on my behalf- I gave it my email, not my consent and wonder what heck kind of app this is? How do I get rid of it ? Insure there's no identity theft ??