Would you like to count how many sources you have? This is an example of how we count data sources at Whatagraph:
Client A uses 1 Facebook Page, 1 Facebook Ads, and 1 Instagram - 3 sources.
Client B uses 1 Google Analytics, 1 Facebook Ads, 1 Facebook Page, and 1 Instagram - 4 sources.
That's 7 data sources in total. Please note, that only individual sources are counted.