Last week, while on Facebook on my iPhone, I started to get this warning banner from my phone, asking me if I want to leave Facebook.  It comes up at least once daily now.

This warning comes up on my iPhone from time-to-time while I am on Facebook. Do you have any idea why? (Staff Photo)

Here's what the script says:

Leave Facbook?  This webpage is trying to open an app outside of Facebook.  Are you sure you want to open it?

And then the banner gives me the option to "Cancel" or "Open App" (I always click "Cancel").

Why do I keep getting this warning?  It seems to pop up at random times.  Help!