Illegal to make money on directing users to someone else's website?

Let's say I made an iPhone app, and I charged for downloads. If all the app did was open someone else's webpage, would that be illegal?

I would be making money on simply directing users to a website. I know it's a silly concept but I'm curious.

Ever see things on Facebook that say something like "I watch him go up to this little boy and then I couldn't believe my eyes!" You click the link and it takes you to site. Your clicking just gave someone money. Click bait.
http://www.wired.com/...clickbait/