If you’ve ever wondered how a tech company makes its money, this handy page from Seer Interactive might be the best way to find out. The page lists almost 50 of the most popular companies and services, then details how exactly they’re making their money and if they’re profitable or not.

Besides some of the obvious ones like Facebook or Twitter, some interesting facts you can find are that despite their popularity, Amazon’s Kindle device business and Amazon Prime service are not profitable, though they are successful at bringing in people to the Amazon ecosystem. Also, the arguable leader in music streaming, Spotify, is also not yet profitable (but did raise large amounts via investors).

You can find out more interesting facts about your favorite tech companies here.

[via Seer Interactive]