Have all your new Twitter followers added into a Spreadsheet, to determine if they should be followed back (High following (1,000s) usually means no an authentic account). For the authentic followers, track the website, profiles name, location and followers)
Then
Add row to spreadsheet
This action will add a single row to the bottom of the first worksheet of a spreadsheet you specify. Note: a new spreadsheet is created after 2000 rows.
Explore more great ways to automate Twitter and Google Sheets