Every leaderboard needs a list of players. The Player Source tells Leaderboarded where you want to get your list of players from.

There are 6 possible sources:

a. Manually adding players one by one

b. A Google Spreadsheet

c. Custom / API – for developers

d. Twitter – based on a twitter keyword

e. Leaderboarded – from other leaderboards

f. Nimble – from your CRM system