An analytics pixel will record things like overall page views and can even show you information regarding where different audience segments are coming from on the web.
To add Google Analytics to your campaign click on 'Settings' in the top right corner of your dashboard.
(Note: this article is only applicable for landing pages, forms, bonus entry sweepstakes. It doesn't apply to other social media contests like photo Contest, video contest, etc)
There will be tabs to add your code on the Main Page or Thank You page.
In Google Analytics copy the Global Site Tag which can be found in the Tracking Info Code of your Analytics Account.
Paste this in the Google Analytics text box, if you want it added to both the Main Page and Thank You page be sure to check this option here.
Alternatively you can add a different code to to the Thank You page by clicking the tab here
Then just click Save and your code will be added to your page.