how to add facebook pixel to your web application in Vaadin 7

I am new to vaadin and know just a little about html and javascript , but I know preety well pure java. 

I am working on my web application using the vaadin 7 and I need a way to add a facebook pixel to the application. to those of you who are not familiar with this term , it is just a piece of code that needs to be inserted between the head tags on the html. 

just like the google analytics pixel only that I have found an addon for google analytics but not for facebook . 

I'd appriciate your help in guiding me how to add my own tags to the html page

Hallo Yinon,

please refer to this page
https://vaadin.com/wiki/-/wiki/Main/Customizing+the+startup+page+in+an+application
to learn how you can modify Vaadin7's HTML.

Also, the Google Analytics Tracker Vaadin Add-On has its source code here:
https://github.com/samie/vaadin-ga-tracker
so you should be able to change it according to your needs.

Hope this helps,
--Enver