We count a data load when a user of your website loads a page with the GraphComment iframe, regardless of the number of comments loaded.
We count one each time our API responds to return the list of comments attached to a page.
So, basically, it's very close to the concept of page views.
You can track your precise consumption of page views in the "Statistics" tab of your GraphComment administration.
Note: calls to our TOP widget API if you use it, will also count towards your total monthly data loads.