Websites and apps allow their users to log in using Facebook as opposed to the traditional email address/password. Thinknum tracks these logins over time, which provides insight into active user metrics. These metrics can be used as proxy for traction of a specific website/app.
Below is an example of Tinders Monthly Active User Rank. This metric ranks Tinder's login activity in regards to other apps.
Here is the link for the documentation on the columns for this dataset: Columns Definition