Customizing <head> on each page?

I'm trying to install Facebook tracking pixels in one of our apps, however they need to be customized in the <head> of each page to contain the correct tracking link.   I can edit the overall index.html in the theme folder but that doesn't help me with customizing which tracking link is tracked on various pages.  Any ideas?
1 answers

What if you used the html snippet to add the html tag you need.

You could edit the index file and add a generic line in the head of the file, and then write a jquery script that will append/change the html line for every page a user is on.