As you may already know, Number of Followers is the only metric in our toolbox that can’t be calculated retroactively. It starts calculating only from the day you connect your pages to True. What a pity. :(
But don’t despair, there’s a workaround to this inconvenience. If you used different analysis software before or have just stored your old reports with historical data for the Number of Followers, you can simply import the file into your True account. And you’ll enjoy an uninterrupted historical trend of Followers growth.
Use .CSV file format. The data in the file should be in the following format: date,followers